Ba2Y5F19 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one F(13), one F(2), one F(4), and one F(9) atom to form BaF4 trigonal pyramids that share  a cornercorner with one Y(4)F6 octahedra,  a cornercorner with one Y(5)F6 octahedra, and corners with two equivalent Y(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 14-41°. In the second Ba site, Ba(2) is bonded to one F(11), one F(17), one F(19), and one F(7) atom to form distorted BaF4 trigonal pyramids that share  a cornercorner with one Y(1)F6 octahedra,  a cornercorner with one Y(3)F6 octahedra, and corners with two equivalent Y(4)F6 octahedra. The corner-sharing octahedral tilt angles range from 16-43°. There are five inequivalent Y sites. In the first Y site, Y(1) is bonded to one F(18), one F(6), one F(7), one F(8), and two equivalent F(1) atoms to form YF6 octahedra that share corners with two equivalent Y(1)F6 octahedra, corners with three equivalent Y(4)F6 octahedra, and  a cornercorner with one Ba(2)F4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 7-16°. In the second Y site, Y(2) is bonded to one F(10), one F(14), one F(15), one F(3), and two equivalent F(5) atoms to form corner-sharing YF6 octahedra. The corner-sharing octahedral tilt angles range from 2-9°. In the third Y site, Y(3) is bonded to one F(11), one F(12), one F(16), one F(2), one F(3), and one F(4) atom to form YF6 octahedra that share  a cornercorner with one Y(2)F6 octahedra, corners with two equivalent Y(5)F6 octahedra,  a cornercorner with one Ba(2)F4 trigonal pyramid, and corners with two equivalent Ba(1)F4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 9-12°. In the fourth Y site, Y(4) is bonded to one F(17), one F(18), one F(19), one F(6), one F(8), and one F(9) atom to form YF6 octahedra that share corners with three equivalent Y(1)F6 octahedra,  a cornercorner with one Ba(1)F4 trigonal pyramid, and corners with two equivalent Ba(2)F4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 7-16°. In the fifth Y site, Y(5) is bonded to one F(10), one F(12), one F(13), one F(14), one F(15), and one F(16) atom to form YF6 octahedra that share corners with two equivalent Y(3)F6 octahedra, corners with three equivalent Y(2)F6 octahedra, and  a cornercorner with one Ba(1)F4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 2-12°. There are nineteen inequivalent F sites. In the first F site, F(1) is bonded in a linear geometry to two equivalent Y(1) atoms. In the second F site, F(2) is bonded in a linear geometry to one Ba(1) and one Y(3) atom. In the third F site, F(3) is bonded in a linear geometry to one Y(2) and one Y(3) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(3) atom. In the fifth F site, F(5) is bonded in a linear geometry to two equivalent Y(2) atoms. In the sixth F site, F(6) is bonded in a linear geometry to one Y(1) and one Y(4) atom. In the seventh F site, F(7) is bonded in a bent 150 degrees geometry to one Ba(2) and one Y(1) atom. In the eighth F site, F(8) is bonded in a linear geometry to one Y(1) and one Y(4) atom. In the ninth F site, F(9) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(4) atom. In the tenth F site, F(10) is bonded in a linear geometry to one Y(2) and one Y(5) atom. In the eleventh F site, F(11) is bonded in a distorted bent 150 degrees geometry to one Ba(2) and one Y(3) atom. In the twelfth F site, F(12) is bonded in a linear geometry to one Y(3) and one Y(5) atom. In the thirteenth F site, F(13) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(5) atom. In the fourteenth F site, F(14) is bonded in a linear geometry to one Y(2) and one Y(5) atom. In the fifteenth F site, F(15) is bonded in a linear geometry to one Y(2) and one Y(5) atom. In the sixteenth F site, F(16) is bonded in a linear geometry to one Y(3) and one Y(5) atom. In the seventeenth F site, F(17) is bonded in a bent 150 degrees geometry to one Ba(2) and one Y(4) atom. In the eighteenth F site, F(18) is bonded in a linear geometry to one Y(1) and one Y(4) atom. In the nineteenth F site, F(19) is bonded in a linear geometry to one Ba(2) and one Y(4) atom.
Ba2Y5F19 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one F(13), one F(2), one F(4), and one F(9) atom to form BaF4 trigonal pyramids that share  a cornercorner with one Y(4)F6 octahedra,  a cornercorner with one Y(5)F6 octahedra, and corners with two equivalent Y(3)F6 octahedra. The corner-sharing octahedral tilt angles range from 14-41°. The Ba(1)-F(13) bond length is 2.47 Å. The Ba(1)-F(2) bond length is 2.46 Å. The Ba(1)-F(4) bond length is 2.48 Å. The Ba(1)-F(9) bond length is 2.51 Å. In the second Ba site, Ba(2) is bonded to one F(11), one F(17), one F(19), and one F(7) atom to form distorted BaF4 trigonal pyramids that share  a cornercorner with one Y(1)F6 octahedra,  a cornercorner with one Y(3)F6 octahedra, and corners with two equivalent Y(4)F6 octahedra. The corner-sharing octahedral tilt angles range from 16-43°. The Ba(2)-F(11) bond length is 2.53 Å. The Ba(2)-F(17) bond length is 2.48 Å. The Ba(2)-F(19) bond length is 2.46 Å. The Ba(2)-F(7) bond length is 2.47 Å. There are five inequivalent Y sites. In the first Y site, Y(1) is bonded to one F(18), one F(6), one F(7), one F(8), and two equivalent F(1) atoms to form YF6 octahedra that share corners with two equivalent Y(1)F6 octahedra, corners with three equivalent Y(4)F6 octahedra, and  a cornercorner with one Ba(2)F4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 7-16°. The Y(1)-F(18) bond length is 2.20 Å. The Y(1)-F(6) bond length is 2.20 Å. The Y(1)-F(7) bond length is 2.16 Å. The Y(1)-F(8) bond length is 2.21 Å. Both Y(1)-F(1) bond lengths are 2.22 Å. In the second Y site, Y(2) is bonded to one F(10), one F(14), one F(15), one F(3), and two equivalent F(5) atoms to form corner-sharing YF6 octahedra. The corner-sharing octahedral tilt angles range from 2-9°. The Y(2)-F(10) bond length is 2.22 Å. The Y(2)-F(14) bond length is 2.19 Å. The Y(2)-F(15) bond length is 2.22 Å. The Y(2)-F(3) bond length is 2.21 Å. Both Y(2)-F(5) bond lengths are 2.22 Å. In the third Y site, Y(3) is bonded to one F(11), one F(12), one F(16), one F(2), one F(3), and one F(4) atom to form YF6 octahedra that share  a cornercorner with one Y(2)F6 octahedra, corners with two equivalent Y(5)F6 octahedra,  a cornercorner with one Ba(2)F4 trigonal pyramid, and corners with two equivalent Ba(1)F4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 9-12°. The Y(3)-F(11) bond length is 2.19 Å. The Y(3)-F(12) bond length is 2.21 Å. The Y(3)-F(16) bond length is 2.19 Å. The Y(3)-F(2) bond length is 2.19 Å. The Y(3)-F(3) bond length is 2.23 Å. The Y(3)-F(4) bond length is 2.21 Å. In the fourth Y site, Y(4) is bonded to one F(17), one F(18), one F(19), one F(6), one F(8), and one F(9) atom to form YF6 octahedra that share corners with three equivalent Y(1)F6 octahedra,  a cornercorner with one Ba(1)F4 trigonal pyramid, and corners with two equivalent Ba(2)F4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 7-16°. The Y(4)-F(17) bond length is 2.21 Å. The Y(4)-F(18) bond length is 2.21 Å. The Y(4)-F(19) bond length is 2.18 Å. The Y(4)-F(6) bond length is 2.19 Å. The Y(4)-F(8) bond length is 2.21 Å. The Y(4)-F(9) bond length is 2.19 Å. In the fifth Y site, Y(5) is bonded to one F(10), one F(12), one F(13), one F(14), one F(15), and one F(16) atom to form YF6 octahedra that share corners with two equivalent Y(3)F6 octahedra, corners with three equivalent Y(2)F6 octahedra, and  a cornercorner with one Ba(1)F4 trigonal pyramid. The corner-sharing octahedral tilt angles range from 2-12°. The Y(5)-F(10) bond length is 2.22 Å. The Y(5)-F(12) bond length is 2.22 Å. The Y(5)-F(13) bond length is 2.17 Å. The Y(5)-F(14) bond length is 2.20 Å. The Y(5)-F(15) bond length is 2.22 Å. The Y(5)-F(16) bond length is 2.20 Å. There are nineteen inequivalent F sites. In the first F site, F(1) is bonded in a linear geometry to two equivalent Y(1) atoms. In the second F site, F(2) is bonded in a linear geometry to one Ba(1) and one Y(3) atom. In the third F site, F(3) is bonded in a linear geometry to one Y(2) and one Y(3) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(3) atom. In the fifth F site, F(5) is bonded in a linear geometry to two equivalent Y(2) atoms. In the sixth F site, F(6) is bonded in a linear geometry to one Y(1) and one Y(4) atom. In the seventh F site, F(7) is bonded in a bent 150 degrees geometry to one Ba(2) and one Y(1) atom. In the eighth F site, F(8) is bonded in a linear geometry to one Y(1) and one Y(4) atom. In the ninth F site, F(9) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(4) atom. In the tenth F site, F(10) is bonded in a linear geometry to one Y(2) and one Y(5) atom. In the eleventh F site, F(11) is bonded in a distorted bent 150 degrees geometry to one Ba(2) and one Y(3) atom. In the twelfth F site, F(12) is bonded in a linear geometry to one Y(3) and one Y(5) atom. In the thirteenth F site, F(13) is bonded in a bent 150 degrees geometry to one Ba(1) and one Y(5) atom. In the fourteenth F site, F(14) is bonded in a linear geometry to one Y(2) and one Y(5) atom. In the fifteenth F site, F(15) is bonded in a linear geometry to one Y(2) and one Y(5) atom. In the sixteenth F site, F(16) is bonded in a linear geometry to one Y(3) and one Y(5) atom. In the seventeenth F site, F(17) is bonded in a bent 150 degrees geometry to one Ba(2) and one Y(4) atom. In the eighteenth F site, F(18) is bonded in a linear geometry to one Y(1) and one Y(4) atom. In the nineteenth F site, F(19) is bonded in a linear geometry to one Ba(2) and one Y(4) atom.