U8Bi2O19 is alpha bismuth trifluoride-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(12), two equivalent O(13), and two equivalent O(14) atoms. In the second U site, U(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(13), two equivalent O(14), and two equivalent O(15) atoms. In the third U site, U(3) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(15), two equivalent O(16), and two equivalent O(2) atoms. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to two equivalent O(16), two equivalent O(17), two equivalent O(2), and two equivalent O(3) atoms. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(3), and two equivalent O(4) atoms. In the sixth U site, U(6) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(4), and two equivalent O(5) atoms. In the seventh U site, U(7) is bonded in a body-centered cubic geometry to two equivalent O(19), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the eighth U site, U(8) is bonded in a body-centered cubic geometry to two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(12) atoms. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent U(2) and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the second O site, O(2) is bonded to two equivalent U(3) and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the third O site, O(3) is bonded to two equivalent U(4) and two equivalent U(5) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent U(5) and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent U(6) and two equivalent U(7) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent U(7) and two equivalent U(8) atoms to form OU4 tetrahedra that share corners with two equivalent O(9)U2Bi2 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with four equivalent O(8)U2Bi2 tetrahedra, corners with four equivalent O(5)U4 tetrahedra, corners with four equivalent O(6)U4 tetrahedra,  an edgeedge with one O(9)U2Bi2 tetrahedra,  an edgeedge with one O(19)U4 tetrahedra, and edges with four equivalent O(7)U4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent U(7) and two equivalent U(8) atoms to form OU4 tetrahedra that share corners with two equivalent O(8)U2Bi2 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with four equivalent O(9)U2Bi2 tetrahedra, corners with four equivalent O(19)U4 tetrahedra, corners with four equivalent O(7)U4 tetrahedra,  an edgeedge with one O(8)U2Bi2 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra, and edges with four equivalent O(6)U4 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent U(8) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(11)Bi4 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with four equivalent O(8)U2Bi2 tetrahedra, corners with four equivalent O(6)U4 tetrahedra,  an edgeedge with one O(11)Bi4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra, and edges with four equivalent O(9)U2Bi2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent U(8) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(6)U4 tetrahedra, corners with four equivalent O(11)Bi4 tetrahedra, corners with four equivalent O(9)U2Bi2 tetrahedra, corners with four equivalent O(7)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra, and edges with four equivalent O(8)U2Bi2 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent U(1) and two equivalent Bi(2) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(11)Bi4 tetrahedra, corners with two equivalent O(14)U4 tetrahedra, corners with four equivalent O(10)U2Bi2 tetrahedra, corners with four equivalent O(13)U4 tetrahedra,  an edgeedge with one O(11)Bi4 tetrahedra,  an edgeedge with one O(14)U4 tetrahedra, and edges with four equivalent O(12)U2Bi2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form OBi4 tetrahedra that share corners with two equivalent O(10)U2Bi2 tetrahedra, corners with two equivalent O(8)U2Bi2 tetrahedra, corners with four equivalent O(11)Bi4 tetrahedra, corners with four equivalent O(12)U2Bi2 tetrahedra, corners with four equivalent O(9)U2Bi2 tetrahedra,  an edgeedge with one O(10)U2Bi2 tetrahedra, and  an edgeedge with one O(8)U2Bi2 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent U(1) and two equivalent Bi(2) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(13)U4 tetrahedra, corners with four equivalent O(11)Bi4 tetrahedra, corners with four equivalent O(12)U2Bi2 tetrahedra, corners with four equivalent O(14)U4 tetrahedra,  an edgeedge with one O(13)U4 tetrahedra, and edges with four equivalent O(10)U2Bi2 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent U(1) and two equivalent U(2) atoms to form OU4 tetrahedra that share corners with two equivalent O(12)U2Bi2 tetrahedra, corners with two equivalent O(15)U4 tetrahedra, corners with four equivalent O(10)U2Bi2 tetrahedra, corners with four equivalent O(1)U4 tetrahedra, corners with four equivalent O(13)U4 tetrahedra,  an edgeedge with one O(12)U2Bi2 tetrahedra,  an edgeedge with one O(15)U4 tetrahedra, and edges with four equivalent O(14)U4 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent U(1) and two equivalent U(2) atoms to form OU4 tetrahedra that share corners with two equivalent O(10)U2Bi2 tetrahedra, corners with two equivalent O(1)U4 tetrahedra, corners with four equivalent O(12)U2Bi2 tetrahedra, corners with four equivalent O(14)U4 tetrahedra, corners with four equivalent O(15)U4 tetrahedra,  an edgeedge with one O(10)U2Bi2 tetrahedra,  an edgeedge with one O(1)U4 tetrahedra, and edges with four equivalent O(13)U4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent U(2) and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent U(3) and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent U(4) and two equivalent U(5) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent U(5) and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent U(6) and two equivalent U(7) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra.
U8Bi2O19 is alpha bismuth trifluoride-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent U sites. In the first U site, U(1) is bonded in a body-centered cubic geometry to two equivalent O(10), two equivalent O(12), two equivalent O(13), and two equivalent O(14) atoms. There is one shorter (2.24 Å) and one longer (2.27 Å) U(1)-O(10) bond length. There is one shorter (2.25 Å) and one longer (2.26 Å) U(1)-O(12) bond length. There is one shorter (2.38 Å) and one longer (2.39 Å) U(1)-O(13) bond length. There is one shorter (2.39 Å) and one longer (2.41 Å) U(1)-O(14) bond length. In the second U site, U(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(13), two equivalent O(14), and two equivalent O(15) atoms. Both U(2)-O(1) bond lengths are 2.36 Å. Both U(2)-O(13) bond lengths are 2.33 Å. Both U(2)-O(14) bond lengths are 2.32 Å. There is one shorter (2.35 Å) and one longer (2.36 Å) U(2)-O(15) bond length. In the third U site, U(3) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(15), two equivalent O(16), and two equivalent O(2) atoms. There is one shorter (2.34 Å) and one longer (2.35 Å) U(3)-O(1) bond length. There is one shorter (2.35 Å) and one longer (2.36 Å) U(3)-O(15) bond length. There is one shorter (2.35 Å) and one longer (2.36 Å) U(3)-O(16) bond length. There is one shorter (2.35 Å) and one longer (2.36 Å) U(3)-O(2) bond length. In the fourth U site, U(4) is bonded in a body-centered cubic geometry to two equivalent O(16), two equivalent O(17), two equivalent O(2), and two equivalent O(3) atoms. There is one shorter (2.35 Å) and one longer (2.36 Å) U(4)-O(16) bond length. Both U(4)-O(17) bond lengths are 2.36 Å. Both U(4)-O(2) bond lengths are 2.36 Å. There is one shorter (2.35 Å) and one longer (2.37 Å) U(4)-O(3) bond length. In the fifth U site, U(5) is bonded in a body-centered cubic geometry to two equivalent O(17), two equivalent O(18), two equivalent O(3), and two equivalent O(4) atoms. Both U(5)-O(17) bond lengths are 2.36 Å. Both U(5)-O(18) bond lengths are 2.36 Å. Both U(5)-O(3) bond lengths are 2.36 Å. There is one shorter (2.35 Å) and one longer (2.36 Å) U(5)-O(4) bond length. In the sixth U site, U(6) is bonded in a body-centered cubic geometry to two equivalent O(18), two equivalent O(19), two equivalent O(4), and two equivalent O(5) atoms. Both U(6)-O(18) bond lengths are 2.36 Å. Both U(6)-O(19) bond lengths are 2.35 Å. Both U(6)-O(4) bond lengths are 2.36 Å. Both U(6)-O(5) bond lengths are 2.35 Å. In the seventh U site, U(7) is bonded in a body-centered cubic geometry to two equivalent O(19), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. Both U(7)-O(19) bond lengths are 2.36 Å. Both U(7)-O(5) bond lengths are 2.36 Å. Both U(7)-O(6) bond lengths are 2.33 Å. There is one shorter (2.32 Å) and one longer (2.33 Å) U(7)-O(7) bond length. In the eighth U site, U(8) is bonded in a body-centered cubic geometry to two equivalent O(6), two equivalent O(7), two equivalent O(8), and two equivalent O(9) atoms. There is one shorter (2.39 Å) and one longer (2.40 Å) U(8)-O(6) bond length. There is one shorter (2.39 Å) and one longer (2.40 Å) U(8)-O(7) bond length. There is one shorter (2.25 Å) and one longer (2.27 Å) U(8)-O(8) bond length. There is one shorter (2.24 Å) and one longer (2.25 Å) U(8)-O(9) bond length. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(8), and two equivalent O(9) atoms. Both Bi(1)-O(11) bond lengths are 2.34 Å. Both Bi(1)-O(8) bond lengths are 2.50 Å. Both Bi(1)-O(9) bond lengths are 2.52 Å. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(10), two equivalent O(11), and two equivalent O(12) atoms. Both Bi(2)-O(10) bond lengths are 2.50 Å. Both Bi(2)-O(11) bond lengths are 2.33 Å. Both Bi(2)-O(12) bond lengths are 2.50 Å. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded to two equivalent U(2) and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the second O site, O(2) is bonded to two equivalent U(3) and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the third O site, O(3) is bonded to two equivalent U(4) and two equivalent U(5) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fourth O site, O(4) is bonded to two equivalent U(5) and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent U(6) and two equivalent U(7) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixth O site, O(6) is bonded to two equivalent U(7) and two equivalent U(8) atoms to form OU4 tetrahedra that share corners with two equivalent O(9)U2Bi2 tetrahedra, corners with two equivalent O(19)U4 tetrahedra, corners with four equivalent O(8)U2Bi2 tetrahedra, corners with four equivalent O(5)U4 tetrahedra, corners with four equivalent O(6)U4 tetrahedra,  an edgeedge with one O(9)U2Bi2 tetrahedra,  an edgeedge with one O(19)U4 tetrahedra, and edges with four equivalent O(7)U4 tetrahedra. In the seventh O site, O(7) is bonded to two equivalent U(7) and two equivalent U(8) atoms to form OU4 tetrahedra that share corners with two equivalent O(8)U2Bi2 tetrahedra, corners with two equivalent O(5)U4 tetrahedra, corners with four equivalent O(9)U2Bi2 tetrahedra, corners with four equivalent O(19)U4 tetrahedra, corners with four equivalent O(7)U4 tetrahedra,  an edgeedge with one O(8)U2Bi2 tetrahedra,  an edgeedge with one O(5)U4 tetrahedra, and edges with four equivalent O(6)U4 tetrahedra. In the eighth O site, O(8) is bonded to two equivalent U(8) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(11)Bi4 tetrahedra, corners with two equivalent O(7)U4 tetrahedra, corners with four equivalent O(8)U2Bi2 tetrahedra, corners with four equivalent O(6)U4 tetrahedra,  an edgeedge with one O(11)Bi4 tetrahedra,  an edgeedge with one O(7)U4 tetrahedra, and edges with four equivalent O(9)U2Bi2 tetrahedra. In the ninth O site, O(9) is bonded to two equivalent U(8) and two equivalent Bi(1) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(6)U4 tetrahedra, corners with four equivalent O(11)Bi4 tetrahedra, corners with four equivalent O(9)U2Bi2 tetrahedra, corners with four equivalent O(7)U4 tetrahedra,  an edgeedge with one O(6)U4 tetrahedra, and edges with four equivalent O(8)U2Bi2 tetrahedra. In the tenth O site, O(10) is bonded to two equivalent U(1) and two equivalent Bi(2) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(11)Bi4 tetrahedra, corners with two equivalent O(14)U4 tetrahedra, corners with four equivalent O(10)U2Bi2 tetrahedra, corners with four equivalent O(13)U4 tetrahedra,  an edgeedge with one O(11)Bi4 tetrahedra,  an edgeedge with one O(14)U4 tetrahedra, and edges with four equivalent O(12)U2Bi2 tetrahedra. In the eleventh O site, O(11) is bonded to two equivalent Bi(1) and two equivalent Bi(2) atoms to form OBi4 tetrahedra that share corners with two equivalent O(10)U2Bi2 tetrahedra, corners with two equivalent O(8)U2Bi2 tetrahedra, corners with four equivalent O(11)Bi4 tetrahedra, corners with four equivalent O(12)U2Bi2 tetrahedra, corners with four equivalent O(9)U2Bi2 tetrahedra,  an edgeedge with one O(10)U2Bi2 tetrahedra, and  an edgeedge with one O(8)U2Bi2 tetrahedra. In the twelfth O site, O(12) is bonded to two equivalent U(1) and two equivalent Bi(2) atoms to form OU2Bi2 tetrahedra that share corners with two equivalent O(13)U4 tetrahedra, corners with four equivalent O(11)Bi4 tetrahedra, corners with four equivalent O(12)U2Bi2 tetrahedra, corners with four equivalent O(14)U4 tetrahedra,  an edgeedge with one O(13)U4 tetrahedra, and edges with four equivalent O(10)U2Bi2 tetrahedra. In the thirteenth O site, O(13) is bonded to two equivalent U(1) and two equivalent U(2) atoms to form OU4 tetrahedra that share corners with two equivalent O(12)U2Bi2 tetrahedra, corners with two equivalent O(15)U4 tetrahedra, corners with four equivalent O(10)U2Bi2 tetrahedra, corners with four equivalent O(1)U4 tetrahedra, corners with four equivalent O(13)U4 tetrahedra,  an edgeedge with one O(12)U2Bi2 tetrahedra,  an edgeedge with one O(15)U4 tetrahedra, and edges with four equivalent O(14)U4 tetrahedra. In the fourteenth O site, O(14) is bonded to two equivalent U(1) and two equivalent U(2) atoms to form OU4 tetrahedra that share corners with two equivalent O(10)U2Bi2 tetrahedra, corners with two equivalent O(1)U4 tetrahedra, corners with four equivalent O(12)U2Bi2 tetrahedra, corners with four equivalent O(14)U4 tetrahedra, corners with four equivalent O(15)U4 tetrahedra,  an edgeedge with one O(10)U2Bi2 tetrahedra,  an edgeedge with one O(1)U4 tetrahedra, and edges with four equivalent O(13)U4 tetrahedra. In the fifteenth O site, O(15) is bonded to two equivalent U(2) and two equivalent U(3) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the sixteenth O site, O(16) is bonded to two equivalent U(3) and two equivalent U(4) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the seventeenth O site, O(17) is bonded to two equivalent U(4) and two equivalent U(5) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the eighteenth O site, O(18) is bonded to two equivalent U(5) and two equivalent U(6) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra. In the nineteenth O site, O(19) is bonded to two equivalent U(6) and two equivalent U(7) atoms to form a mixture of edge and corner-sharing OU4 tetrahedra.