Bi8La10O27 crystallizes in the triclinic P1 space group. There are ten inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(19), one O(23), one O(26), one O(27), one O(5), and one O(8) atom. In the second La site, La(2) is bonded to one O(14), one O(18), one O(20), one O(24), one O(25), one O(6), and one O(7) atom to form distorted LaO7 hexagonal pyramids that share  a cornercorner with one Bi(3)O4 trigonal pyramid,  an edgeedge with one La(10)O7 hexagonal pyramid,  an edgeedge with one La(7)O7 hexagonal pyramid, and edges with two equivalent La(4)O7 hexagonal pyramids. In the third La site, La(3) is bonded to one O(13), one O(15), one O(21), one O(26), one O(27), one O(5), and one O(8) atom to form distorted LaO7 hexagonal pyramids that share  an edgeedge with one La(10)O7 hexagonal pyramid and  an edgeedge with one Bi(3)O4 trigonal pyramid. In the fourth La site, La(4) is bonded to one O(16), one O(17), one O(22), one O(24), one O(25), one O(6), and one O(7) atom to form distorted edge-sharing LaO7 hexagonal pyramids. In the fifth La site, La(5) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(14), one O(15), one O(16), one O(25), one O(26), and one O(3) atom. In the sixth La site, La(6) is bonded in a body-centered cubic geometry to one O(11), one O(14), one O(15), one O(16), one O(2), one O(24), one O(27), and one O(4) atom. In the seventh La site, La(7) is bonded to one O(1), one O(11), one O(12), one O(20), one O(22), one O(4), and one O(7) atom to form distorted LaO7 hexagonal pyramids that share  an edgeedge with one La(2)O7 hexagonal pyramid,  an edgeedge with one La(4)O7 hexagonal pyramid, and  an edgeedge with one Bi(3)O4 trigonal pyramid. In the eighth La site, La(8) is bonded in a distorted body-centered cubic geometry to one O(1), one O(10), one O(13), one O(15), one O(20), one O(22), one O(4), and one O(6) atom. In the ninth La site, La(9) is bonded in a distorted body-centered cubic geometry to one O(16), one O(17), one O(2), one O(21), one O(23), one O(3), one O(8), and one O(9) atom. In the tenth La site, La(10) is bonded to one O(14), one O(18), one O(2), one O(21), one O(23), one O(3), and one O(5) atom to form distorted LaO7 hexagonal pyramids that share  a cornercorner with one Bi(3)O4 trigonal pyramid,  an edgeedge with one La(2)O7 hexagonal pyramid, and  an edgeedge with one La(3)O7 hexagonal pyramid. There are eight inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a see-saw-like geometry to one O(10), one O(2), one O(4), and one O(9) atom. In the second Bi site, Bi(2) is bonded in a see-saw-like geometry to one O(1), one O(10), one O(3), and one O(9) atom. In the third Bi site, Bi(3) is bonded to one O(12), one O(13), one O(20), and one O(5) atom to form distorted BiO4 trigonal pyramids that share  a cornercorner with one La(10)O7 hexagonal pyramid,  a cornercorner with one La(2)O7 hexagonal pyramid,  an edgeedge with one La(3)O7 hexagonal pyramid, and  an edgeedge with one La(7)O7 hexagonal pyramid. In the fourth Bi site, Bi(4) is bonded in a 4-coordinate geometry to one O(12), one O(13), one O(22), and one O(8) atom. In the fifth Bi site, Bi(5) is bonded in a 4-coordinate geometry to one O(17), one O(18), one O(21), and one O(6) atom. In the sixth Bi site, Bi(6) is bonded in a 4-coordinate geometry to one O(17), one O(18), one O(23), and one O(7) atom. In the seventh Bi site, Bi(7) is bonded in a distorted T-shaped geometry to one O(19), one O(24), and one O(27) atom. In the eighth Bi site, Bi(8) is bonded in a distorted T-shaped geometry to one O(19), one O(25), and one O(26) atom. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded to one La(5), one La(7), one La(8), and one Bi(2) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(22)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra, and  an edgeedge with one O(15)La4 tetrahedra. In the second O site, O(2) is bonded to one La(10), one La(6), one La(9), and one Bi(1) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(23)La3Bi tetrahedra, corners with two equivalent O(3)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the third O site, O(3) is bonded to one La(10), one La(5), one La(9), and one Bi(2) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(21)La3Bi tetrahedra,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the fourth O site, O(4) is bonded to one La(6), one La(7), one La(8), and one Bi(1) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(20)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra, and  an edgeedge with one O(15)La4 tetrahedra. In the fifth O site, O(5) is bonded to one La(1), one La(10), one La(3), and one Bi(3) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(27)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra, and  an edgeedge with one O(26)La3Bi tetrahedra. In the sixth O site, O(6) is bonded to one La(2), one La(4), one La(8), and one Bi(5) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(7)La3Bi tetrahedra, corners with two equivalent O(25)La3Bi trigonal pyramids,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra, and  an edgeedge with one O(24)La3Bi trigonal pyramid. In the seventh O site, O(7) is bonded to one La(2), one La(4), one La(7), and one Bi(6) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(24)La3Bi trigonal pyramids,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the eighth O site, O(8) is bonded to one La(1), one La(3), one La(9), and one Bi(4) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(26)La3Bi tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra, and  an edgeedge with one O(27)La3Bi tetrahedra. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one La(9), one Bi(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a trigonal non-coplanar geometry to one La(8), one Bi(1), and one Bi(2) atom. In the eleventh O site, O(11) is bonded to one La(1), one La(5), one La(6), and one La(7) atom to form OLa4 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(14)La4 tetrahedra, corners with two equivalent O(15)La4 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(26)La3Bi tetrahedra,  an edgeedge with one O(27)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the twelfth O site, O(12) is bonded to one La(1), one La(7), one Bi(3), and one Bi(4) atom to form OLa2Bi2 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra, corners with two equivalent O(13)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(8)La3Bi tetrahedra, and  an edgeedge with one O(11)La4 tetrahedra. In the thirteenth O site, O(13) is bonded to one La(3), one La(8), one Bi(3), and one Bi(4) atom to form distorted OLa2Bi2 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra, corners with two equivalent O(12)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(8)La3Bi tetrahedra, and  an edgeedge with one O(15)La4 tetrahedra. In the fourteenth O site, O(14) is bonded to one La(10), one La(2), one La(5), and one La(6) atom to form OLa4 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra, corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(16)La4 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(15)La4 tetrahedra,  an edgeedge with one O(24)La3Bi trigonal pyramid, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the fifteenth O site, O(15) is bonded to one La(3), one La(5), one La(6), and one La(8) atom to form OLa4 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(16)La4 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(26)La3Bi tetrahedra,  an edgeedge with one O(27)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra, and  an edgeedge with one O(14)La4 tetrahedra. In the sixteenth O site, O(16) is bonded to one La(4), one La(5), one La(6), and one La(9) atom to form OLa4 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(14)La4 tetrahedra, corners with two equivalent O(15)La4 tetrahedra,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(24)La3Bi trigonal pyramid, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the seventeenth O site, O(17) is bonded to one La(4), one La(9), one Bi(5), and one Bi(6) atom to form distorted OLa2Bi2 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(18)La2Bi2 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra,  an edgeedge with one O(7)La3Bi tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the eighteenth O site, O(18) is bonded to one La(10), one La(2), one Bi(5), and one Bi(6) atom to form OLa2Bi2 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra, corners with two equivalent O(17)La2Bi2 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra,  an edgeedge with one O(7)La3Bi tetrahedra, and  an edgeedge with one O(14)La4 tetrahedra. In the nineteenth O site, O(19) is bonded in a distorted bent 150 degrees geometry to one La(1), one Bi(7), and one Bi(8) atom. In the twentieth O site, O(20) is bonded to one La(2), one La(7), one La(8), and one Bi(3) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(22)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra, and  an edgeedge with one O(7)La3Bi tetrahedra. In the twenty-first O site, O(21) is bonded to one La(10), one La(3), one La(9), and one Bi(5) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(23)La3Bi tetrahedra, corners with two equivalent O(3)La3Bi tetrahedra,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra, and  an edgeedge with one O(8)La3Bi tetrahedra. In the twenty-second O site, O(22) is bonded to one La(4), one La(7), one La(8), and one Bi(4) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(20)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra, and  an edgeedge with one O(7)La3Bi tetrahedra. In the twenty-third O site, O(23) is bonded to one La(1), one La(10), one La(9), and one Bi(6) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(21)La3Bi tetrahedra,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra, and  an edgeedge with one O(8)La3Bi tetrahedra. In the twenty-fourth O site, O(24) is bonded to one La(2), one La(4), one La(6), and one Bi(7) atom to form distorted OLa3Bi trigonal pyramids that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(7)La3Bi tetrahedra, corners with two equivalent O(25)La3Bi trigonal pyramids,  an edgeedge with one O(27)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the twenty-fifth O site, O(25) is bonded to one La(2), one La(4), one La(5), and one Bi(8) atom to form distorted OLa3Bi trigonal pyramids that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(24)La3Bi trigonal pyramids,  an edgeedge with one O(26)La3Bi tetrahedra,  an edgeedge with one O(7)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the twenty-sixth O site, O(26) is bonded to one La(1), one La(3), one La(5), and one Bi(8) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(27)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(15)La4 tetrahedra, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the twenty-seventh O site, O(27) is bonded to one La(1), one La(3), one La(6), and one Bi(7) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(26)La3Bi tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra,  an edgeedge with one O(8)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(15)La4 tetrahedra, and  an edgeedge with one O(24)La3Bi trigonal pyramid.
Bi8La10O27 crystallizes in the triclinic P1 space group. There are ten inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(19), one O(23), one O(26), one O(27), one O(5), and one O(8) atom. The La(1)-O(11) bond length is 2.29 Å. The La(1)-O(12) bond length is 2.57 Å. The La(1)-O(19) bond length is 2.96 Å. The La(1)-O(23) bond length is 2.46 Å. The La(1)-O(26) bond length is 2.66 Å. The La(1)-O(27) bond length is 2.66 Å. The La(1)-O(5) bond length is 2.53 Å. The La(1)-O(8) bond length is 2.47 Å. In the second La site, La(2) is bonded to one O(14), one O(18), one O(20), one O(24), one O(25), one O(6), and one O(7) atom to form distorted LaO7 hexagonal pyramids that share  a cornercorner with one Bi(3)O4 trigonal pyramid,  an edgeedge with one La(10)O7 hexagonal pyramid,  an edgeedge with one La(7)O7 hexagonal pyramid, and edges with two equivalent La(4)O7 hexagonal pyramids. The La(2)-O(14) bond length is 2.30 Å. The La(2)-O(18) bond length is 2.50 Å. The La(2)-O(20) bond length is 2.45 Å. The La(2)-O(24) bond length is 2.65 Å. The La(2)-O(25) bond length is 2.62 Å. The La(2)-O(6) bond length is 2.44 Å. The La(2)-O(7) bond length is 2.46 Å. In the third La site, La(3) is bonded to one O(13), one O(15), one O(21), one O(26), one O(27), one O(5), and one O(8) atom to form distorted LaO7 hexagonal pyramids that share  an edgeedge with one La(10)O7 hexagonal pyramid and  an edgeedge with one Bi(3)O4 trigonal pyramid. The La(3)-O(13) bond length is 2.43 Å. The La(3)-O(15) bond length is 2.43 Å. The La(3)-O(21) bond length is 2.49 Å. The La(3)-O(26) bond length is 2.46 Å. The La(3)-O(27) bond length is 2.46 Å. The La(3)-O(5) bond length is 2.51 Å. The La(3)-O(8) bond length is 2.46 Å. In the fourth La site, La(4) is bonded to one O(16), one O(17), one O(22), one O(24), one O(25), one O(6), and one O(7) atom to form distorted edge-sharing LaO7 hexagonal pyramids. The La(4)-O(16) bond length is 2.39 Å. The La(4)-O(17) bond length is 2.45 Å. The La(4)-O(22) bond length is 2.49 Å. The La(4)-O(24) bond length is 2.53 Å. The La(4)-O(25) bond length is 2.53 Å. The La(4)-O(6) bond length is 2.46 Å. The La(4)-O(7) bond length is 2.50 Å. In the fifth La site, La(5) is bonded in a body-centered cubic geometry to one O(1), one O(11), one O(14), one O(15), one O(16), one O(25), one O(26), and one O(3) atom. The La(5)-O(1) bond length is 2.56 Å. The La(5)-O(11) bond length is 2.55 Å. The La(5)-O(14) bond length is 2.53 Å. The La(5)-O(15) bond length is 2.51 Å. The La(5)-O(16) bond length is 2.53 Å. The La(5)-O(25) bond length is 2.88 Å. The La(5)-O(26) bond length is 2.73 Å. The La(5)-O(3) bond length is 2.57 Å. In the sixth La site, La(6) is bonded in a body-centered cubic geometry to one O(11), one O(14), one O(15), one O(16), one O(2), one O(24), one O(27), and one O(4) atom. The La(6)-O(11) bond length is 2.54 Å. The La(6)-O(14) bond length is 2.55 Å. The La(6)-O(15) bond length is 2.51 Å. The La(6)-O(16) bond length is 2.55 Å. The La(6)-O(2) bond length is 2.57 Å. The La(6)-O(24) bond length is 2.81 Å. The La(6)-O(27) bond length is 2.71 Å. The La(6)-O(4) bond length is 2.57 Å. In the seventh La site, La(7) is bonded to one O(1), one O(11), one O(12), one O(20), one O(22), one O(4), and one O(7) atom to form distorted LaO7 hexagonal pyramids that share  an edgeedge with one La(2)O7 hexagonal pyramid,  an edgeedge with one La(4)O7 hexagonal pyramid, and  an edgeedge with one Bi(3)O4 trigonal pyramid. The La(7)-O(1) bond length is 2.40 Å. The La(7)-O(11) bond length is 2.43 Å. The La(7)-O(12) bond length is 2.45 Å. The La(7)-O(20) bond length is 2.55 Å. The La(7)-O(22) bond length is 2.51 Å. The La(7)-O(4) bond length is 2.39 Å. The La(7)-O(7) bond length is 2.53 Å. In the eighth La site, La(8) is bonded in a distorted body-centered cubic geometry to one O(1), one O(10), one O(13), one O(15), one O(20), one O(22), one O(4), and one O(6) atom. The La(8)-O(1) bond length is 2.67 Å. The La(8)-O(10) bond length is 2.45 Å. The La(8)-O(13) bond length is 2.81 Å. The La(8)-O(15) bond length is 2.33 Å. The La(8)-O(20) bond length is 2.61 Å. The La(8)-O(22) bond length is 2.56 Å. The La(8)-O(4) bond length is 2.64 Å. The La(8)-O(6) bond length is 2.51 Å. In the ninth La site, La(9) is bonded in a distorted body-centered cubic geometry to one O(16), one O(17), one O(2), one O(21), one O(23), one O(3), one O(8), and one O(9) atom. The La(9)-O(16) bond length is 2.36 Å. The La(9)-O(17) bond length is 2.73 Å. The La(9)-O(2) bond length is 2.66 Å. The La(9)-O(21) bond length is 2.57 Å. The La(9)-O(23) bond length is 2.59 Å. The La(9)-O(3) bond length is 2.68 Å. The La(9)-O(8) bond length is 2.52 Å. The La(9)-O(9) bond length is 2.45 Å. In the tenth La site, La(10) is bonded to one O(14), one O(18), one O(2), one O(21), one O(23), one O(3), and one O(5) atom to form distorted LaO7 hexagonal pyramids that share  a cornercorner with one Bi(3)O4 trigonal pyramid,  an edgeedge with one La(2)O7 hexagonal pyramid, and  an edgeedge with one La(3)O7 hexagonal pyramid. The La(10)-O(14) bond length is 2.44 Å. The La(10)-O(18) bond length is 2.48 Å. The La(10)-O(2) bond length is 2.38 Å. The La(10)-O(21) bond length is 2.52 Å. The La(10)-O(23) bond length is 2.53 Å. The La(10)-O(3) bond length is 2.39 Å. The La(10)-O(5) bond length is 2.52 Å. There are eight inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a see-saw-like geometry to one O(10), one O(2), one O(4), and one O(9) atom. The Bi(1)-O(10) bond length is 2.26 Å. The Bi(1)-O(2) bond length is 2.10 Å. The Bi(1)-O(4) bond length is 2.10 Å. The Bi(1)-O(9) bond length is 2.24 Å. In the second Bi site, Bi(2) is bonded in a see-saw-like geometry to one O(1), one O(10), one O(3), and one O(9) atom. The Bi(2)-O(1) bond length is 2.10 Å. The Bi(2)-O(10) bond length is 2.26 Å. The Bi(2)-O(3) bond length is 2.10 Å. The Bi(2)-O(9) bond length is 2.25 Å. In the third Bi site, Bi(3) is bonded to one O(12), one O(13), one O(20), and one O(5) atom to form distorted BiO4 trigonal pyramids that share  a cornercorner with one La(10)O7 hexagonal pyramid,  a cornercorner with one La(2)O7 hexagonal pyramid,  an edgeedge with one La(3)O7 hexagonal pyramid, and  an edgeedge with one La(7)O7 hexagonal pyramid. The Bi(3)-O(12) bond length is 2.22 Å. The Bi(3)-O(13) bond length is 2.20 Å. The Bi(3)-O(20) bond length is 2.14 Å. The Bi(3)-O(5) bond length is 2.15 Å. In the fourth Bi site, Bi(4) is bonded in a 4-coordinate geometry to one O(12), one O(13), one O(22), and one O(8) atom. The Bi(4)-O(12) bond length is 2.26 Å. The Bi(4)-O(13) bond length is 2.23 Å. The Bi(4)-O(22) bond length is 2.18 Å. The Bi(4)-O(8) bond length is 2.14 Å. In the fifth Bi site, Bi(5) is bonded in a 4-coordinate geometry to one O(17), one O(18), one O(21), and one O(6) atom. The Bi(5)-O(17) bond length is 2.21 Å. The Bi(5)-O(18) bond length is 2.27 Å. The Bi(5)-O(21) bond length is 2.19 Å. The Bi(5)-O(6) bond length is 2.14 Å. In the sixth Bi site, Bi(6) is bonded in a 4-coordinate geometry to one O(17), one O(18), one O(23), and one O(7) atom. The Bi(6)-O(17) bond length is 2.20 Å. The Bi(6)-O(18) bond length is 2.25 Å. The Bi(6)-O(23) bond length is 2.14 Å. The Bi(6)-O(7) bond length is 2.17 Å. In the seventh Bi site, Bi(7) is bonded in a distorted T-shaped geometry to one O(19), one O(24), and one O(27) atom. The Bi(7)-O(19) bond length is 2.10 Å. The Bi(7)-O(24) bond length is 2.05 Å. The Bi(7)-O(27) bond length is 2.05 Å. In the eighth Bi site, Bi(8) is bonded in a distorted T-shaped geometry to one O(19), one O(25), and one O(26) atom. The Bi(8)-O(19) bond length is 2.10 Å. The Bi(8)-O(25) bond length is 2.05 Å. The Bi(8)-O(26) bond length is 2.05 Å. There are twenty-seven inequivalent O sites. In the first O site, O(1) is bonded to one La(5), one La(7), one La(8), and one Bi(2) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(22)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra, and  an edgeedge with one O(15)La4 tetrahedra. In the second O site, O(2) is bonded to one La(10), one La(6), one La(9), and one Bi(1) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(23)La3Bi tetrahedra, corners with two equivalent O(3)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the third O site, O(3) is bonded to one La(10), one La(5), one La(9), and one Bi(2) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(21)La3Bi tetrahedra,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the fourth O site, O(4) is bonded to one La(6), one La(7), one La(8), and one Bi(1) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(20)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra, and  an edgeedge with one O(15)La4 tetrahedra. In the fifth O site, O(5) is bonded to one La(1), one La(10), one La(3), and one Bi(3) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(27)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra, and  an edgeedge with one O(26)La3Bi tetrahedra. In the sixth O site, O(6) is bonded to one La(2), one La(4), one La(8), and one Bi(5) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(7)La3Bi tetrahedra, corners with two equivalent O(25)La3Bi trigonal pyramids,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra, and  an edgeedge with one O(24)La3Bi trigonal pyramid. In the seventh O site, O(7) is bonded to one La(2), one La(4), one La(7), and one Bi(6) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(24)La3Bi trigonal pyramids,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the eighth O site, O(8) is bonded to one La(1), one La(3), one La(9), and one Bi(4) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(26)La3Bi tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra, and  an edgeedge with one O(27)La3Bi tetrahedra. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one La(9), one Bi(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a trigonal non-coplanar geometry to one La(8), one Bi(1), and one Bi(2) atom. In the eleventh O site, O(11) is bonded to one La(1), one La(5), one La(6), and one La(7) atom to form OLa4 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(14)La4 tetrahedra, corners with two equivalent O(15)La4 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(26)La3Bi tetrahedra,  an edgeedge with one O(27)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the twelfth O site, O(12) is bonded to one La(1), one La(7), one Bi(3), and one Bi(4) atom to form OLa2Bi2 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra, corners with two equivalent O(13)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(8)La3Bi tetrahedra, and  an edgeedge with one O(11)La4 tetrahedra. In the thirteenth O site, O(13) is bonded to one La(3), one La(8), one Bi(3), and one Bi(4) atom to form distorted OLa2Bi2 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra, corners with two equivalent O(12)La2Bi2 tetrahedra,  an edgeedge with one O(20)La3Bi tetrahedra,  an edgeedge with one O(22)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(8)La3Bi tetrahedra, and  an edgeedge with one O(15)La4 tetrahedra. In the fourteenth O site, O(14) is bonded to one La(10), one La(2), one La(5), and one La(6) atom to form OLa4 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra, corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(16)La4 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(15)La4 tetrahedra,  an edgeedge with one O(24)La3Bi trigonal pyramid, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the fifteenth O site, O(15) is bonded to one La(3), one La(5), one La(6), and one La(8) atom to form OLa4 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(16)La4 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(26)La3Bi tetrahedra,  an edgeedge with one O(27)La3Bi tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra, and  an edgeedge with one O(14)La4 tetrahedra. In the sixteenth O site, O(16) is bonded to one La(4), one La(5), one La(6), and one La(9) atom to form OLa4 tetrahedra that share  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(14)La4 tetrahedra, corners with two equivalent O(15)La4 tetrahedra,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(24)La3Bi trigonal pyramid, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the seventeenth O site, O(17) is bonded to one La(4), one La(9), one Bi(5), and one Bi(6) atom to form distorted OLa2Bi2 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra, corners with two equivalent O(18)La2Bi2 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra,  an edgeedge with one O(7)La3Bi tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the eighteenth O site, O(18) is bonded to one La(10), one La(2), one Bi(5), and one Bi(6) atom to form OLa2Bi2 tetrahedra that share  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra, corners with two equivalent O(17)La2Bi2 tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(21)La3Bi tetrahedra,  an edgeedge with one O(23)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra,  an edgeedge with one O(7)La3Bi tetrahedra, and  an edgeedge with one O(14)La4 tetrahedra. In the nineteenth O site, O(19) is bonded in a distorted bent 150 degrees geometry to one La(1), one Bi(7), and one Bi(8) atom. In the twentieth O site, O(20) is bonded to one La(2), one La(7), one La(8), and one Bi(3) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(22)La3Bi tetrahedra, corners with two equivalent O(4)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(1)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra, and  an edgeedge with one O(7)La3Bi tetrahedra. In the twenty-first O site, O(21) is bonded to one La(10), one La(3), one La(9), and one Bi(5) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(6)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(23)La3Bi tetrahedra, corners with two equivalent O(3)La3Bi tetrahedra,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra, and  an edgeedge with one O(8)La3Bi tetrahedra. In the twenty-second O site, O(22) is bonded to one La(4), one La(7), one La(8), and one Bi(4) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(8)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(1)La3Bi tetrahedra, corners with two equivalent O(20)La3Bi tetrahedra,  a cornercorner with one O(24)La3Bi trigonal pyramid,  a cornercorner with one O(25)La3Bi trigonal pyramid,  an edgeedge with one O(12)La2Bi2 tetrahedra,  an edgeedge with one O(13)La2Bi2 tetrahedra,  an edgeedge with one O(4)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra, and  an edgeedge with one O(7)La3Bi tetrahedra. In the twenty-third O site, O(23) is bonded to one La(1), one La(10), one La(9), and one Bi(6) atom to form OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(26)La3Bi tetrahedra,  a cornercorner with one O(27)La3Bi tetrahedra,  a cornercorner with one O(7)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with two equivalent O(21)La3Bi tetrahedra,  an edgeedge with one O(17)La2Bi2 tetrahedra,  an edgeedge with one O(18)La2Bi2 tetrahedra,  an edgeedge with one O(3)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra, and  an edgeedge with one O(8)La3Bi tetrahedra. In the twenty-fourth O site, O(24) is bonded to one La(2), one La(4), one La(6), and one Bi(7) atom to form distorted OLa3Bi trigonal pyramids that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(7)La3Bi tetrahedra, corners with two equivalent O(25)La3Bi trigonal pyramids,  an edgeedge with one O(27)La3Bi tetrahedra,  an edgeedge with one O(6)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the twenty-fifth O site, O(25) is bonded to one La(2), one La(4), one La(5), and one Bi(8) atom to form distorted OLa3Bi trigonal pyramids that share  a cornercorner with one O(17)La2Bi2 tetrahedra,  a cornercorner with one O(18)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(20)La3Bi tetrahedra,  a cornercorner with one O(22)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(11)La4 tetrahedra,  a cornercorner with one O(15)La4 tetrahedra, corners with two equivalent O(6)La3Bi tetrahedra, corners with two equivalent O(24)La3Bi trigonal pyramids,  an edgeedge with one O(26)La3Bi tetrahedra,  an edgeedge with one O(7)La3Bi tetrahedra,  an edgeedge with one O(14)La4 tetrahedra, and  an edgeedge with one O(16)La4 tetrahedra. In the twenty-sixth O site, O(26) is bonded to one La(1), one La(3), one La(5), and one Bi(8) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(1)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(3)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(27)La3Bi tetrahedra, corners with two equivalent O(8)La3Bi tetrahedra,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(15)La4 tetrahedra, and  an edgeedge with one O(25)La3Bi trigonal pyramid. In the twenty-seventh O site, O(27) is bonded to one La(1), one La(3), one La(6), and one Bi(7) atom to form distorted OLa3Bi tetrahedra that share  a cornercorner with one O(12)La2Bi2 tetrahedra,  a cornercorner with one O(13)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(21)La3Bi tetrahedra,  a cornercorner with one O(23)La3Bi tetrahedra,  a cornercorner with one O(4)La3Bi tetrahedra,  a cornercorner with one O(14)La4 tetrahedra,  a cornercorner with one O(16)La4 tetrahedra, corners with two equivalent O(26)La3Bi tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra,  an edgeedge with one O(8)La3Bi tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(15)La4 tetrahedra, and  an edgeedge with one O(24)La3Bi trigonal pyramid.