Ca2YbF7 crystallizes in the triclinic P1 space group. There are ten inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 10-coordinate geometry to one F(1), one F(14), one F(2), one F(24), one F(26), one F(27), one F(3), one F(30), one F(4), and one F(6) atom. In the second Ca site, Ca(2) is bonded in a 10-coordinate geometry to one F(1), one F(10), one F(12), one F(13), one F(18), one F(2), one F(29), one F(3), one F(33), and one F(9) atom. In the third Ca site, Ca(3) is bonded in a 10-coordinate geometry to one F(10), one F(16), one F(17), one F(20), one F(21), one F(24), one F(32), one F(4), one F(6), and one F(9) atom. In the fourth Ca site, Ca(4) is bonded in a 10-coordinate geometry to one F(12), one F(14), one F(15), one F(19), one F(20), one F(22), one F(23), one F(5), one F(8), and one F(9) atom. In the fifth Ca site, Ca(5) is bonded in a 10-coordinate geometry to one F(12), one F(13), one F(16), one F(17), one F(21), one F(23), one F(26), one F(27), one F(29), and one F(35) atom. In the sixth Ca site, Ca(6) is bonded in a 10-coordinate geometry to one F(11), one F(15), one F(16), one F(18), one F(19), one F(20), one F(25), one F(26), one F(28), and one F(30) atom. In the seventh Ca site, Ca(7) is bonded in a body-centered cubic geometry to one F(13), one F(17), one F(19), one F(22), one F(28), one F(3), one F(31), and one F(6) atom. In the eighth Ca site, Ca(8) is bonded in a 10-coordinate geometry to one F(2), one F(22), one F(23), one F(25), one F(26), one F(31), one F(32), one F(33), one F(34), and one F(5) atom. In the ninth Ca site, Ca(9) is bonded in a 8-coordinate geometry to one F(10), one F(13), one F(21), one F(25), one F(28), one F(32), one F(34), one F(35), and one F(7) atom. In the tenth Ca site, Ca(10) is bonded in a 10-coordinate geometry to one F(11), one F(28), one F(30), one F(31), one F(33), one F(34), one F(35), one F(4), one F(8), and one F(9) atom. There are five inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 8-coordinate geometry to one F(11), one F(12), one F(15), one F(16), one F(2), one F(34), one F(4), one F(5), and one F(7) atom. In the second Yb site, Yb(2) is bonded in a 8-coordinate geometry to one F(11), one F(18), one F(19), one F(27), one F(29), one F(3), one F(35), one F(7), and one F(8) atom. In the third Yb site, Yb(3) is bonded in a 9-coordinate geometry to one F(1), one F(10), one F(14), one F(15), one F(18), one F(22), one F(25), one F(6), and one F(7) atom. In the fourth Yb site, Yb(4) is bonded in a 8-coordinate geometry to one F(1), one F(20), one F(21), one F(23), one F(24), one F(29), one F(30), one F(33), and one F(7) atom. In the fifth Yb site, Yb(5) is bonded in a 8-coordinate geometry to one F(14), one F(17), one F(24), one F(27), one F(31), one F(32), one F(5), one F(7), and one F(8) atom. There are thirty-five inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Yb(3), and one Yb(4) atom. In the second F site, F(2) is bonded to one Ca(1), one Ca(2), one Ca(8), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra,  an edgeedge with one F(4)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 56°. In the third F site, F(3) is bonded to one Ca(1), one Ca(2), one Ca(7), and one Yb(2) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra, and  an edgeedge with one F(13)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. In the fourth F site, F(4) is bonded to one Ca(1), one Ca(10), one Ca(3), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 56°. In the fifth F site, F(5) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(8), one Yb(1), and one Yb(5) atom. In the sixth F site, F(6) is bonded to one Ca(1), one Ca(3), one Ca(7), and one Yb(3) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(4)Ca3Yb tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the seventh F site, F(7) is bonded to one Ca(9), one Yb(1), one Yb(2), one Yb(3), one Yb(4), and one Yb(5) atom to form FCaYb5 octahedra that share  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra, corners with two equivalent F(27)Ca2Yb2 tetrahedra, corners with two equivalent F(8)Ca2Yb2 tetrahedra, corners with two equivalent F(10)Ca3Yb tetrahedra, and corners with two equivalent F(25)Ca3Yb tetrahedra. In the eighth F site, F(8) is bonded to one Ca(10), one Ca(4), one Yb(2), and one Yb(5) atom to form FCa2Yb2 tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the ninth F site, F(9) is bonded to one Ca(10), one Ca(2), one Ca(3), and one Ca(4) atom to form FCa4 tetrahedra that share  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra, and  an edgeedge with one F(4)Ca3Yb tetrahedra. In the tenth F site, F(10) is bonded to one Ca(2), one Ca(3), one Ca(9), and one Yb(3) atom to form FCa3Yb tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra,  an edgeedge with one F(13)Ca4 tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the eleventh F site, F(11) is bonded in a 4-coordinate geometry to one Ca(10), one Ca(6), one Yb(1), and one Yb(2) atom. In the twelfth F site, F(12) is bonded to one Ca(2), one Ca(4), one Ca(5), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(13)Ca4 tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the thirteenth F site, F(13) is bonded to one Ca(2), one Ca(5), one Ca(7), and one Ca(9) atom to form FCa4 tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the fourteenth F site, F(14) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Yb(3), and one Yb(5) atom. In the fifteenth F site, F(15) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(6), one Yb(1), and one Yb(3) atom. In the sixteenth F site, F(16) is bonded to one Ca(3), one Ca(5), one Ca(6), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(4)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. In the seventeenth F site, F(17) is bonded to one Ca(3), one Ca(5), one Ca(7), and one Yb(5) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra, and  an edgeedge with one F(13)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. In the eighteenth F site, F(18) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(6), one Yb(2), and one Yb(3) atom. In the nineteenth F site, F(19) is bonded to one Ca(4), one Ca(6), one Ca(7), and one Yb(2) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. In the twentieth F site, F(20) is bonded to one Ca(3), one Ca(4), one Ca(6), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 57°. In the twenty-first F site, F(21) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(5), one Ca(9), and one Yb(4) atom. In the twenty-second F site, F(22) is bonded to one Ca(4), one Ca(7), one Ca(8), and one Yb(3) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(6)Ca3Yb tetrahedra. The corner-sharing octahedral tilt angles are 52°. In the twenty-third F site, F(23) is bonded to one Ca(4), one Ca(5), one Ca(8), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. In the twenty-fourth F site, F(24) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Yb(4), and one Yb(5) atom. In the twenty-fifth F site, F(25) is bonded to one Ca(6), one Ca(8), one Ca(9), and one Yb(3) atom to form FCa3Yb tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(26)Ca4 tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the twenty-sixth F site, F(26) is bonded to one Ca(1), one Ca(5), one Ca(6), and one Ca(8) atom to form FCa4 tetrahedra that share  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra, and  an edgeedge with one F(30)Ca3Yb tetrahedra. In the twenty-seventh F site, F(27) is bonded to one Ca(1), one Ca(5), one Yb(2), and one Yb(5) atom to form FCa2Yb2 tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-57°. In the twenty-eighth F site, F(28) is bonded to one Ca(10), one Ca(6), one Ca(7), and one Ca(9) atom to form FCa4 tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(13)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the twenty-ninth F site, F(29) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(5), one Yb(2), and one Yb(4) atom. In the thirtieth F site, F(30) is bonded to one Ca(1), one Ca(10), one Ca(6), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra,  an edgeedge with one F(4)Ca3Yb tetrahedra,  an edgeedge with one F(26)Ca4 tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the thirty-first F site, F(31) is bonded to one Ca(10), one Ca(7), one Ca(8), and one Yb(5) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. In the thirty-second F site, F(32) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(8), one Ca(9), and one Yb(5) atom. In the thirty-third F site, F(33) is bonded to one Ca(10), one Ca(2), one Ca(8), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. In the thirty-fourth F site, F(34) is bonded in a 4-coordinate geometry to one Ca(10), one Ca(8), one Ca(9), and one Yb(1) atom. In the thirty-fifth F site, F(35) is bonded in a 4-coordinate geometry to one Ca(10), one Ca(5), one Ca(9), and one Yb(2) atom.
Ca2YbF7 crystallizes in the triclinic P1 space group. There are ten inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 10-coordinate geometry to one F(1), one F(14), one F(2), one F(24), one F(26), one F(27), one F(3), one F(30), one F(4), and one F(6) atom. The Ca(1)-F(1) bond length is 2.60 Å. The Ca(1)-F(14) bond length is 2.62 Å. The Ca(1)-F(2) bond length is 2.58 Å. The Ca(1)-F(24) bond length is 2.78 Å. The Ca(1)-F(26) bond length is 2.46 Å. The Ca(1)-F(27) bond length is 2.31 Å. The Ca(1)-F(3) bond length is 2.44 Å. The Ca(1)-F(30) bond length is 2.39 Å. The Ca(1)-F(4) bond length is 2.39 Å. The Ca(1)-F(6) bond length is 2.63 Å. In the second Ca site, Ca(2) is bonded in a 10-coordinate geometry to one F(1), one F(10), one F(12), one F(13), one F(18), one F(2), one F(29), one F(3), one F(33), and one F(9) atom. The Ca(2)-F(1) bond length is 2.73 Å. The Ca(2)-F(10) bond length is 2.29 Å. The Ca(2)-F(12) bond length is 2.58 Å. The Ca(2)-F(13) bond length is 2.44 Å. The Ca(2)-F(18) bond length is 2.61 Å. The Ca(2)-F(2) bond length is 2.40 Å. The Ca(2)-F(29) bond length is 2.58 Å. The Ca(2)-F(3) bond length is 2.63 Å. The Ca(2)-F(33) bond length is 2.42 Å. The Ca(2)-F(9) bond length is 2.49 Å. In the third Ca site, Ca(3) is bonded in a 10-coordinate geometry to one F(10), one F(16), one F(17), one F(20), one F(21), one F(24), one F(32), one F(4), one F(6), and one F(9) atom. The Ca(3)-F(10) bond length is 2.29 Å. The Ca(3)-F(16) bond length is 2.40 Å. The Ca(3)-F(17) bond length is 2.64 Å. The Ca(3)-F(20) bond length is 2.44 Å. The Ca(3)-F(21) bond length is 2.82 Å. The Ca(3)-F(24) bond length is 2.56 Å. The Ca(3)-F(32) bond length is 2.68 Å. The Ca(3)-F(4) bond length is 2.56 Å. The Ca(3)-F(6) bond length is 2.47 Å. The Ca(3)-F(9) bond length is 2.42 Å. In the fourth Ca site, Ca(4) is bonded in a 10-coordinate geometry to one F(12), one F(14), one F(15), one F(19), one F(20), one F(22), one F(23), one F(5), one F(8), and one F(9) atom. The Ca(4)-F(12) bond length is 2.42 Å. The Ca(4)-F(14) bond length is 2.69 Å. The Ca(4)-F(15) bond length is 2.53 Å. The Ca(4)-F(19) bond length is 2.44 Å. The Ca(4)-F(20) bond length is 2.54 Å. The Ca(4)-F(22) bond length is 2.62 Å. The Ca(4)-F(23) bond length is 2.42 Å. The Ca(4)-F(5) bond length is 2.77 Å. The Ca(4)-F(8) bond length is 2.29 Å. The Ca(4)-F(9) bond length is 2.45 Å. In the fifth Ca site, Ca(5) is bonded in a 10-coordinate geometry to one F(12), one F(13), one F(16), one F(17), one F(21), one F(23), one F(26), one F(27), one F(29), and one F(35) atom. The Ca(5)-F(12) bond length is 2.42 Å. The Ca(5)-F(13) bond length is 2.62 Å. The Ca(5)-F(16) bond length is 2.55 Å. The Ca(5)-F(17) bond length is 2.47 Å. The Ca(5)-F(21) bond length is 2.53 Å. The Ca(5)-F(23) bond length is 2.44 Å. The Ca(5)-F(26) bond length is 2.46 Å. The Ca(5)-F(27) bond length is 2.31 Å. The Ca(5)-F(29) bond length is 2.74 Å. The Ca(5)-F(35) bond length is 2.68 Å. In the sixth Ca site, Ca(6) is bonded in a 10-coordinate geometry to one F(11), one F(15), one F(16), one F(18), one F(19), one F(20), one F(25), one F(26), one F(28), and one F(30) atom. The Ca(6)-F(11) bond length is 2.55 Å. The Ca(6)-F(15) bond length is 2.86 Å. The Ca(6)-F(16) bond length is 2.47 Å. The Ca(6)-F(18) bond length is 2.68 Å. The Ca(6)-F(19) bond length is 2.62 Å. The Ca(6)-F(20) bond length is 2.38 Å. The Ca(6)-F(25) bond length is 2.29 Å. The Ca(6)-F(26) bond length is 2.44 Å. The Ca(6)-F(28) bond length is 2.42 Å. The Ca(6)-F(30) bond length is 2.59 Å. In the seventh Ca site, Ca(7) is bonded in a body-centered cubic geometry to one F(13), one F(17), one F(19), one F(22), one F(28), one F(3), one F(31), and one F(6) atom. The Ca(7)-F(13) bond length is 2.31 Å. The Ca(7)-F(17) bond length is 2.34 Å. The Ca(7)-F(19) bond length is 2.32 Å. The Ca(7)-F(22) bond length is 2.33 Å. The Ca(7)-F(28) bond length is 2.31 Å. The Ca(7)-F(3) bond length is 2.32 Å. The Ca(7)-F(31) bond length is 2.33 Å. The Ca(7)-F(6) bond length is 2.33 Å. In the eighth Ca site, Ca(8) is bonded in a 10-coordinate geometry to one F(2), one F(22), one F(23), one F(25), one F(26), one F(31), one F(32), one F(33), one F(34), and one F(5) atom. The Ca(8)-F(2) bond length is 2.40 Å. The Ca(8)-F(22) bond length is 2.49 Å. The Ca(8)-F(23) bond length is 2.54 Å. The Ca(8)-F(25) bond length is 2.30 Å. The Ca(8)-F(26) bond length is 2.48 Å. The Ca(8)-F(31) bond length is 2.65 Å. The Ca(8)-F(32) bond length is 2.61 Å. The Ca(8)-F(33) bond length is 2.41 Å. The Ca(8)-F(34) bond length is 2.72 Å. The Ca(8)-F(5) bond length is 2.58 Å. In the ninth Ca site, Ca(9) is bonded in a 8-coordinate geometry to one F(10), one F(13), one F(21), one F(25), one F(28), one F(32), one F(34), one F(35), and one F(7) atom. The Ca(9)-F(10) bond length is 2.33 Å. The Ca(9)-F(13) bond length is 2.40 Å. The Ca(9)-F(21) bond length is 2.31 Å. The Ca(9)-F(25) bond length is 2.39 Å. The Ca(9)-F(28) bond length is 2.39 Å. The Ca(9)-F(32) bond length is 2.26 Å. The Ca(9)-F(34) bond length is 2.29 Å. The Ca(9)-F(35) bond length is 2.27 Å. The Ca(9)-F(7) bond length is 2.99 Å. In the tenth Ca site, Ca(10) is bonded in a 10-coordinate geometry to one F(11), one F(28), one F(30), one F(31), one F(33), one F(34), one F(35), one F(4), one F(8), and one F(9) atom. The Ca(10)-F(11) bond length is 2.78 Å. The Ca(10)-F(28) bond length is 2.63 Å. The Ca(10)-F(30) bond length is 2.39 Å. The Ca(10)-F(31) bond length is 2.45 Å. The Ca(10)-F(33) bond length is 2.56 Å. The Ca(10)-F(34) bond length is 2.59 Å. The Ca(10)-F(35) bond length is 2.61 Å. The Ca(10)-F(4) bond length is 2.43 Å. The Ca(10)-F(8) bond length is 2.32 Å. The Ca(10)-F(9) bond length is 2.46 Å. There are five inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 8-coordinate geometry to one F(11), one F(12), one F(15), one F(16), one F(2), one F(34), one F(4), one F(5), and one F(7) atom. The Yb(1)-F(11) bond length is 2.26 Å. The Yb(1)-F(12) bond length is 2.35 Å. The Yb(1)-F(15) bond length is 2.25 Å. The Yb(1)-F(16) bond length is 2.35 Å. The Yb(1)-F(2) bond length is 2.37 Å. The Yb(1)-F(34) bond length is 2.24 Å. The Yb(1)-F(4) bond length is 2.35 Å. The Yb(1)-F(5) bond length is 2.26 Å. The Yb(1)-F(7) bond length is 3.03 Å. In the second Yb site, Yb(2) is bonded in a 8-coordinate geometry to one F(11), one F(18), one F(19), one F(27), one F(29), one F(3), one F(35), one F(7), and one F(8) atom. The Yb(2)-F(11) bond length is 2.29 Å. The Yb(2)-F(18) bond length is 2.23 Å. The Yb(2)-F(19) bond length is 2.31 Å. The Yb(2)-F(27) bond length is 2.30 Å. The Yb(2)-F(29) bond length is 2.28 Å. The Yb(2)-F(3) bond length is 2.34 Å. The Yb(2)-F(35) bond length is 2.23 Å. The Yb(2)-F(7) bond length is 2.99 Å. The Yb(2)-F(8) bond length is 2.30 Å. In the third Yb site, Yb(3) is bonded in a 9-coordinate geometry to one F(1), one F(10), one F(14), one F(15), one F(18), one F(22), one F(25), one F(6), and one F(7) atom. The Yb(3)-F(1) bond length is 2.26 Å. The Yb(3)-F(10) bond length is 2.33 Å. The Yb(3)-F(14) bond length is 2.23 Å. The Yb(3)-F(15) bond length is 2.28 Å. The Yb(3)-F(18) bond length is 2.22 Å. The Yb(3)-F(22) bond length is 2.36 Å. The Yb(3)-F(25) bond length is 2.29 Å. The Yb(3)-F(6) bond length is 2.35 Å. The Yb(3)-F(7) bond length is 2.81 Å. In the fourth Yb site, Yb(4) is bonded in a 8-coordinate geometry to one F(1), one F(20), one F(21), one F(23), one F(24), one F(29), one F(30), one F(33), and one F(7) atom. The Yb(4)-F(1) bond length is 2.24 Å. The Yb(4)-F(20) bond length is 2.35 Å. The Yb(4)-F(21) bond length is 2.25 Å. The Yb(4)-F(23) bond length is 2.37 Å. The Yb(4)-F(24) bond length is 2.27 Å. The Yb(4)-F(29) bond length is 2.25 Å. The Yb(4)-F(30) bond length is 2.33 Å. The Yb(4)-F(33) bond length is 2.37 Å. The Yb(4)-F(7) bond length is 3.05 Å. In the fifth Yb site, Yb(5) is bonded in a 8-coordinate geometry to one F(14), one F(17), one F(24), one F(27), one F(31), one F(32), one F(5), one F(7), and one F(8) atom. The Yb(5)-F(14) bond length is 2.24 Å. The Yb(5)-F(17) bond length is 2.32 Å. The Yb(5)-F(24) bond length is 2.27 Å. The Yb(5)-F(27) bond length is 2.30 Å. The Yb(5)-F(31) bond length is 2.35 Å. The Yb(5)-F(32) bond length is 2.22 Å. The Yb(5)-F(5) bond length is 2.26 Å. The Yb(5)-F(7) bond length is 2.95 Å. The Yb(5)-F(8) bond length is 2.30 Å. There are thirty-five inequivalent F sites. In the first F site, F(1) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(2), one Yb(3), and one Yb(4) atom. In the second F site, F(2) is bonded to one Ca(1), one Ca(2), one Ca(8), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra,  an edgeedge with one F(4)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 56°. In the third F site, F(3) is bonded to one Ca(1), one Ca(2), one Ca(7), and one Yb(2) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra, and  an edgeedge with one F(13)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. In the fourth F site, F(4) is bonded to one Ca(1), one Ca(10), one Ca(3), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 56°. In the fifth F site, F(5) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(8), one Yb(1), and one Yb(5) atom. In the sixth F site, F(6) is bonded to one Ca(1), one Ca(3), one Ca(7), and one Yb(3) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(4)Ca3Yb tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the seventh F site, F(7) is bonded to one Ca(9), one Yb(1), one Yb(2), one Yb(3), one Yb(4), and one Yb(5) atom to form FCaYb5 octahedra that share  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra, corners with two equivalent F(27)Ca2Yb2 tetrahedra, corners with two equivalent F(8)Ca2Yb2 tetrahedra, corners with two equivalent F(10)Ca3Yb tetrahedra, and corners with two equivalent F(25)Ca3Yb tetrahedra. In the eighth F site, F(8) is bonded to one Ca(10), one Ca(4), one Yb(2), and one Yb(5) atom to form FCa2Yb2 tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-58°. In the ninth F site, F(9) is bonded to one Ca(10), one Ca(2), one Ca(3), and one Ca(4) atom to form FCa4 tetrahedra that share  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra, and  an edgeedge with one F(4)Ca3Yb tetrahedra. In the tenth F site, F(10) is bonded to one Ca(2), one Ca(3), one Ca(9), and one Yb(3) atom to form FCa3Yb tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra,  an edgeedge with one F(13)Ca4 tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the eleventh F site, F(11) is bonded in a 4-coordinate geometry to one Ca(10), one Ca(6), one Yb(1), and one Yb(2) atom. In the twelfth F site, F(12) is bonded to one Ca(2), one Ca(4), one Ca(5), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(13)Ca4 tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the thirteenth F site, F(13) is bonded to one Ca(2), one Ca(5), one Ca(7), and one Ca(9) atom to form FCa4 tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the fourteenth F site, F(14) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(4), one Yb(3), and one Yb(5) atom. In the fifteenth F site, F(15) is bonded in a 4-coordinate geometry to one Ca(4), one Ca(6), one Yb(1), and one Yb(3) atom. In the sixteenth F site, F(16) is bonded to one Ca(3), one Ca(5), one Ca(6), and one Yb(1) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(4)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. In the seventeenth F site, F(17) is bonded to one Ca(3), one Ca(5), one Ca(7), and one Yb(5) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra,  an edgeedge with one F(6)Ca3Yb tetrahedra, and  an edgeedge with one F(13)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. In the eighteenth F site, F(18) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(6), one Yb(2), and one Yb(3) atom. In the nineteenth F site, F(19) is bonded to one Ca(4), one Ca(6), one Ca(7), and one Yb(2) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. In the twentieth F site, F(20) is bonded to one Ca(3), one Ca(4), one Ca(6), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 57°. In the twenty-first F site, F(21) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(5), one Ca(9), and one Yb(4) atom. In the twenty-second F site, F(22) is bonded to one Ca(4), one Ca(7), one Ca(8), and one Yb(3) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(6)Ca3Yb tetrahedra. The corner-sharing octahedral tilt angles are 52°. In the twenty-third F site, F(23) is bonded to one Ca(4), one Ca(5), one Ca(8), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(12)Ca3Yb tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. In the twenty-fourth F site, F(24) is bonded in a 4-coordinate geometry to one Ca(1), one Ca(3), one Yb(4), and one Yb(5) atom. In the twenty-fifth F site, F(25) is bonded to one Ca(6), one Ca(8), one Ca(9), and one Yb(3) atom to form FCa3Yb tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  an edgeedge with one F(10)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(26)Ca4 tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the twenty-sixth F site, F(26) is bonded to one Ca(1), one Ca(5), one Ca(6), and one Ca(8) atom to form FCa4 tetrahedra that share  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(27)Ca2Yb2 tetrahedra,  an edgeedge with one F(16)Ca3Yb tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra, and  an edgeedge with one F(30)Ca3Yb tetrahedra. In the twenty-seventh F site, F(27) is bonded to one Ca(1), one Ca(5), one Yb(2), and one Yb(5) atom to form FCa2Yb2 tetrahedra that share corners with two equivalent F(7)CaYb5 octahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(3)Ca3Yb tetrahedra, and  an edgeedge with one F(26)Ca4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-57°. In the twenty-eighth F site, F(28) is bonded to one Ca(10), one Ca(6), one Ca(7), and one Ca(9) atom to form FCa4 tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(17)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(33)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(19)Ca3Yb tetrahedra,  an edgeedge with one F(25)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(13)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 51°. In the twenty-ninth F site, F(29) is bonded in a 4-coordinate geometry to one Ca(2), one Ca(5), one Yb(2), and one Yb(4) atom. In the thirtieth F site, F(30) is bonded to one Ca(1), one Ca(10), one Ca(6), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(16)Ca3Yb tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(31)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(20)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra,  an edgeedge with one F(4)Ca3Yb tetrahedra,  an edgeedge with one F(26)Ca4 tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the thirty-first F site, F(31) is bonded to one Ca(10), one Ca(7), one Ca(8), and one Yb(5) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(27)Ca2Yb2 tetrahedra,  a cornercorner with one F(19)Ca3Yb tetrahedra,  a cornercorner with one F(2)Ca3Yb tetrahedra,  a cornercorner with one F(23)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(30)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(6)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(9)Ca4 tetrahedra,  an edgeedge with one F(8)Ca2Yb2 tetrahedra,  an edgeedge with one F(17)Ca3Yb tetrahedra,  an edgeedge with one F(22)Ca3Yb tetrahedra,  an edgeedge with one F(33)Ca3Yb tetrahedra, and  an edgeedge with one F(28)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 50°. In the thirty-second F site, F(32) is bonded in a 4-coordinate geometry to one Ca(3), one Ca(8), one Ca(9), and one Yb(5) atom. In the thirty-third F site, F(33) is bonded to one Ca(10), one Ca(2), one Ca(8), and one Yb(4) atom to form FCa3Yb tetrahedra that share  a cornercorner with one F(7)CaYb5 octahedra,  a cornercorner with one F(8)Ca2Yb2 tetrahedra,  a cornercorner with one F(10)Ca3Yb tetrahedra,  a cornercorner with one F(12)Ca3Yb tetrahedra,  a cornercorner with one F(20)Ca3Yb tetrahedra,  a cornercorner with one F(22)Ca3Yb tetrahedra,  a cornercorner with one F(25)Ca3Yb tetrahedra,  a cornercorner with one F(3)Ca3Yb tetrahedra,  a cornercorner with one F(4)Ca3Yb tetrahedra,  a cornercorner with one F(13)Ca4 tetrahedra,  a cornercorner with one F(26)Ca4 tetrahedra,  a cornercorner with one F(28)Ca4 tetrahedra,  an edgeedge with one F(2)Ca3Yb tetrahedra,  an edgeedge with one F(23)Ca3Yb tetrahedra,  an edgeedge with one F(30)Ca3Yb tetrahedra,  an edgeedge with one F(31)Ca3Yb tetrahedra, and  an edgeedge with one F(9)Ca4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. In the thirty-fourth F site, F(34) is bonded in a 4-coordinate geometry to one Ca(10), one Ca(8), one Ca(9), and one Yb(1) atom. In the thirty-fifth F site, F(35) is bonded in a 4-coordinate geometry to one Ca(10), one Ca(5), one Ca(9), and one Yb(2) atom.