Th8La2O19 is alpha bismuth trifluoride-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are eight inequivalent Th sites. In the first Th site, Th(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(12), two equivalent O(13), and two equivalent O(14) atoms. In the second Th site, Th(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(14), two equivalent O(15), and two equivalent O(2) atoms. In the third Th site, Th(3) is bonded in a body-centered cubic geometry to two equivalent O(15), two equivalent O(16), two equivalent O(2), and two equivalent O(3) atoms. In the fourth Th site, Th(4) is bonded in a body-centered cubic geometry to two equivalent O(16), two equivalent O(17), two equivalent O(3), and two equivalent O(4) atoms. In the fifth Th site, Th(5) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(4), and two equivalent O(5) atoms. In the sixth Th site, Th(6) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(5), and two equivalent O(6) atoms. In the seventh Th site, Th(7) is bonded in a body-centered cubic geometry to two equivalent O(19), two equivalent O(6), two equivalent O(7), and two equivalent O(9) atoms. In the eighth Th site, Th(8) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms. In the second La site, La(2) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(12), and two equivalent O(13) atoms. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(13)La2Th2 tetrahedra, corners with two equivalent O(15)Th4 tetrahedra, corners with four equivalent O(12)La2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra, corners with four equivalent O(2)Th4 tetrahedra,  an edgeedge with one O(13)La2Th2 tetrahedra,  an edgeedge with one O(15)Th4 tetrahedra, and edges with four equivalent O(14)Th4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Th(4) and two equivalent Th(5) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Th(5) and two equivalent Th(6) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Th(6) and two equivalent Th(7) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Th(7) and two equivalent Th(8) atoms to form OTh4 tetrahedra that share corners with two equivalent O(10)La2Th2 tetrahedra, corners with two equivalent O(19)Th4 tetrahedra, corners with four equivalent O(8)La2Th2 tetrahedra, corners with four equivalent O(6)Th4 tetrahedra, corners with four equivalent O(7)Th4 tetrahedra,  an edgeedge with one O(10)La2Th2 tetrahedra,  an edgeedge with one O(19)Th4 tetrahedra, and edges with four equivalent O(9)Th4 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Th(8) and two equivalent La(1) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(9)Th4 tetrahedra, corners with four equivalent O(8)La2Th2 tetrahedra, corners with four equivalent O(7)Th4 tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(9)Th4 tetrahedra, and edges with four equivalent O(10)La2Th2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Th(7) and two equivalent Th(8) atoms to form OTh4 tetrahedra that share corners with two equivalent O(8)La2Th2 tetrahedra, corners with two equivalent O(6)Th4 tetrahedra, corners with four equivalent O(10)La2Th2 tetrahedra, corners with four equivalent O(19)Th4 tetrahedra, corners with four equivalent O(9)Th4 tetrahedra,  an edgeedge with one O(8)La2Th2 tetrahedra,  an edgeedge with one O(6)Th4 tetrahedra, and edges with four equivalent O(7)Th4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Th(8) and two equivalent La(1) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(7)Th4 tetrahedra, corners with four equivalent O(10)La2Th2 tetrahedra, corners with four equivalent O(11)La4 tetrahedra, corners with four equivalent O(9)Th4 tetrahedra,  an edgeedge with one O(7)Th4 tetrahedra, and edges with four equivalent O(8)La2Th2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent La(1) and two equivalent La(2) atoms to form OLa4 tetrahedra that share corners with two equivalent O(12)La2Th2 tetrahedra, corners with two equivalent O(8)La2Th2 tetrahedra, corners with four equivalent O(10)La2Th2 tetrahedra, corners with four equivalent O(13)La2Th2 tetrahedra, corners with four equivalent O(11)La4 tetrahedra,  an edgeedge with one O(12)La2Th2 tetrahedra, and  an edgeedge with one O(8)La2Th2 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent Th(1) and two equivalent La(2) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(14)Th4 tetrahedra, corners with four equivalent O(12)La2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(14)Th4 tetrahedra, and edges with four equivalent O(13)La2Th2 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent Th(1) and two equivalent La(2) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(1)Th4 tetrahedra, corners with four equivalent O(13)La2Th2 tetrahedra, corners with four equivalent O(11)La4 tetrahedra, corners with four equivalent O(14)Th4 tetrahedra,  an edgeedge with one O(1)Th4 tetrahedra, and edges with four equivalent O(12)La2Th2 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(12)La2Th2 tetrahedra, corners with two equivalent O(2)Th4 tetrahedra, corners with four equivalent O(13)La2Th2 tetrahedra, corners with four equivalent O(14)Th4 tetrahedra, corners with four equivalent O(15)Th4 tetrahedra,  an edgeedge with one O(12)La2Th2 tetrahedra,  an edgeedge with one O(2)Th4 tetrahedra, and edges with four equivalent O(1)Th4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent Th(4) and two equivalent Th(5) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent Th(5) and two equivalent Th(6) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent Th(6) and two equivalent Th(7) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra.
Th8La2O19 is alpha bismuth trifluoride-derived structured and crystallizes in the orthorhombic Pmm2 space group. There are eight inequivalent Th sites. In the first Th site, Th(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(12), two equivalent O(13), and two equivalent O(14) atoms. Both Th(1)-O(1) bond lengths are 2.45 Å. Both Th(1)-O(12) bond lengths are 2.32 Å. Both Th(1)-O(13) bond lengths are 2.55 Å. Both Th(1)-O(14) bond lengths are 2.33 Å. In the second Th site, Th(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(14), two equivalent O(15), and two equivalent O(2) atoms. Both Th(2)-O(1) bond lengths are 2.36 Å. Both Th(2)-O(14) bond lengths are 2.48 Å. Both Th(2)-O(15) bond lengths are 2.32 Å. Both Th(2)-O(2) bond lengths are 2.48 Å. In the third Th site, Th(3) is bonded in a body-centered cubic geometry to two equivalent O(15), two equivalent O(16), two equivalent O(2), and two equivalent O(3) atoms. Both Th(3)-O(15) bond lengths are 2.50 Å. Both Th(3)-O(16) bond lengths are 2.33 Å. Both Th(3)-O(2) bond lengths are 2.35 Å. Both Th(3)-O(3) bond lengths are 2.48 Å. In the fourth Th site, Th(4) is bonded in a body-centered cubic geometry to two equivalent O(16), two equivalent O(17), two equivalent O(3), and two equivalent O(4) atoms. Both Th(4)-O(16) bond lengths are 2.50 Å. Both Th(4)-O(17) bond lengths are 2.33 Å. Both Th(4)-O(3) bond lengths are 2.35 Å. Both Th(4)-O(4) bond lengths are 2.48 Å. In the fifth Th site, Th(5) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(4), and two equivalent O(5) atoms. Both Th(5)-O(17) bond lengths are 2.50 Å. Both Th(5)-O(18) bond lengths are 2.33 Å. Both Th(5)-O(4) bond lengths are 2.35 Å. Both Th(5)-O(5) bond lengths are 2.48 Å. In the sixth Th site, Th(6) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(5), and two equivalent O(6) atoms. Both Th(6)-O(18) bond lengths are 2.50 Å. Both Th(6)-O(19) bond lengths are 2.33 Å. Both Th(6)-O(5) bond lengths are 2.35 Å. Both Th(6)-O(6) bond lengths are 2.47 Å. In the seventh Th site, Th(7) is bonded in a body-centered cubic geometry to two equivalent O(19), two equivalent O(6), two equivalent O(7), and two equivalent O(9) atoms. Both Th(7)-O(19) bond lengths are 2.50 Å. Both Th(7)-O(6) bond lengths are 2.35 Å. Both Th(7)-O(7) bond lengths are 2.49 Å. Both Th(7)-O(9) bond lengths are 2.32 Å. In the eighth Th site, Th(8) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. Both Th(8)-O(10) bond lengths are 2.35 Å. Both Th(8)-O(7) bond lengths are 2.34 Å. Both Th(8)-O(8) bond lengths are 2.43 Å. Both Th(8)-O(9) bond lengths are 2.51 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(8) atoms. Both La(1)-O(10) bond lengths are 2.39 Å. Both La(1)-O(11) bond lengths are 2.39 Å. Both La(1)-O(8) bond lengths are 2.31 Å. In the second La site, La(2) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(12), and two equivalent O(13) atoms. Both La(2)-O(11) bond lengths are 2.61 Å. Both La(2)-O(12) bond lengths are 2.44 Å. Both La(2)-O(13) bond lengths are 2.22 Å. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(13)La2Th2 tetrahedra, corners with two equivalent O(15)Th4 tetrahedra, corners with four equivalent O(12)La2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra, corners with four equivalent O(2)Th4 tetrahedra,  an edgeedge with one O(13)La2Th2 tetrahedra,  an edgeedge with one O(15)Th4 tetrahedra, and edges with four equivalent O(14)Th4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the third O site, O(3) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Th(4) and two equivalent Th(5) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Th(5) and two equivalent Th(6) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent Th(6) and two equivalent Th(7) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent Th(7) and two equivalent Th(8) atoms to form OTh4 tetrahedra that share corners with two equivalent O(10)La2Th2 tetrahedra, corners with two equivalent O(19)Th4 tetrahedra, corners with four equivalent O(8)La2Th2 tetrahedra, corners with four equivalent O(6)Th4 tetrahedra, corners with four equivalent O(7)Th4 tetrahedra,  an edgeedge with one O(10)La2Th2 tetrahedra,  an edgeedge with one O(19)Th4 tetrahedra, and edges with four equivalent O(9)Th4 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent Th(8) and two equivalent La(1) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(9)Th4 tetrahedra, corners with four equivalent O(8)La2Th2 tetrahedra, corners with four equivalent O(7)Th4 tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(9)Th4 tetrahedra, and edges with four equivalent O(10)La2Th2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent Th(7) and two equivalent Th(8) atoms to form OTh4 tetrahedra that share corners with two equivalent O(8)La2Th2 tetrahedra, corners with two equivalent O(6)Th4 tetrahedra, corners with four equivalent O(10)La2Th2 tetrahedra, corners with four equivalent O(19)Th4 tetrahedra, corners with four equivalent O(9)Th4 tetrahedra,  an edgeedge with one O(8)La2Th2 tetrahedra,  an edgeedge with one O(6)Th4 tetrahedra, and edges with four equivalent O(7)Th4 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent Th(8) and two equivalent La(1) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(7)Th4 tetrahedra, corners with four equivalent O(10)La2Th2 tetrahedra, corners with four equivalent O(11)La4 tetrahedra, corners with four equivalent O(9)Th4 tetrahedra,  an edgeedge with one O(7)Th4 tetrahedra, and edges with four equivalent O(8)La2Th2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent La(1) and two equivalent La(2) atoms to form OLa4 tetrahedra that share corners with two equivalent O(12)La2Th2 tetrahedra, corners with two equivalent O(8)La2Th2 tetrahedra, corners with four equivalent O(10)La2Th2 tetrahedra, corners with four equivalent O(13)La2Th2 tetrahedra, corners with four equivalent O(11)La4 tetrahedra,  an edgeedge with one O(12)La2Th2 tetrahedra, and  an edgeedge with one O(8)La2Th2 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent Th(1) and two equivalent La(2) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(11)La4 tetrahedra, corners with two equivalent O(14)Th4 tetrahedra, corners with four equivalent O(12)La2Th2 tetrahedra, corners with four equivalent O(1)Th4 tetrahedra,  an edgeedge with one O(11)La4 tetrahedra,  an edgeedge with one O(14)Th4 tetrahedra, and edges with four equivalent O(13)La2Th2 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent Th(1) and two equivalent La(2) atoms to form OLa2Th2 tetrahedra that share corners with two equivalent O(1)Th4 tetrahedra, corners with four equivalent O(13)La2Th2 tetrahedra, corners with four equivalent O(11)La4 tetrahedra, corners with four equivalent O(14)Th4 tetrahedra,  an edgeedge with one O(1)Th4 tetrahedra, and edges with four equivalent O(12)La2Th2 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent Th(1) and two equivalent Th(2) atoms to form OTh4 tetrahedra that share corners with two equivalent O(12)La2Th2 tetrahedra, corners with two equivalent O(2)Th4 tetrahedra, corners with four equivalent O(13)La2Th2 tetrahedra, corners with four equivalent O(14)Th4 tetrahedra, corners with four equivalent O(15)Th4 tetrahedra,  an edgeedge with one O(12)La2Th2 tetrahedra,  an edgeedge with one O(2)Th4 tetrahedra, and edges with four equivalent O(1)Th4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent Th(2) and two equivalent Th(3) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent Th(3) and two equivalent Th(4) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent Th(4) and two equivalent Th(5) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent Th(5) and two equivalent Th(6) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent Th(6) and two equivalent Th(7) atoms to form a mixture of corner and edge-sharing OTh4 tetrahedra.