Bi15YO24 crystallizes in the monoclinic Pm space group. Y(1) is bonded to one O(1), one O(4), two equivalent O(5), and two equivalent O(9) atoms to form distorted YO6 pentagonal pyramids that share edges with two equivalent Bi(8)O6 pentagonal pyramids. There are eleven inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 3-coordinate geometry to one O(1), two equivalent O(11), and two equivalent O(7) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(10), and two equivalent O(6) atoms. In the third Bi site, Bi(3) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(12), and two equivalent O(8) atoms. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(12), one O(2), and one O(7) atom. In the fifth Bi site, Bi(5) is bonded in a 6-coordinate geometry to one O(11), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. In the sixth Bi site, Bi(6) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(13), one O(15), one O(5), and one O(7) atom. In the seventh Bi site, Bi(7) is bonded in a 6-coordinate geometry to one O(11), one O(14), one O(16), one O(6), one O(8), and one O(9) atom. In the eighth Bi site, Bi(8) is bonded to one O(14), one O(15), two equivalent O(5), and two equivalent O(9) atoms to form distorted BiO6 pentagonal pyramids that share edges with two equivalent Y(1)O6 pentagonal pyramids. In the ninth Bi site, Bi(9) is bonded in a 6-coordinate geometry to one O(13), one O(16), two equivalent O(10), and two equivalent O(6) atoms. In the tenth Bi site, Bi(10) is bonded in a 6-coordinate geometry to one O(13), one O(16), two equivalent O(12), and two equivalent O(8) atoms. In the eleventh Bi site, Bi(11) is bonded in a 6-coordinate geometry to one O(14), one O(15), two equivalent O(11), and two equivalent O(7) atoms. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Bi(1), and two equivalent Bi(4) atoms to form distorted OYBi3 tetrahedra that share corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(9)YBi3 tetrahedra,  an edgeedge with one O(2)Bi4 tetrahedra, and edges with two equivalent O(7)Bi4 tetrahedra. In the second O site, O(2) is bonded to one Bi(2), one Bi(3), and two equivalent Bi(4) atoms to form distorted OBi4 tetrahedra that share corners with two equivalent O(7)Bi4 tetrahedra,  an edgeedge with one O(3)Bi4 tetrahedra,  an edgeedge with one O(1)YBi3 tetrahedra, and edges with two equivalent O(10)Bi4 tetrahedra. In the third O site, O(3) is bonded to one Bi(2), one Bi(3), and two equivalent Bi(5) atoms to form distorted OBi4 tetrahedra that share corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(9)YBi3 tetrahedra, and  an edgeedge with one O(2)Bi4 tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1) and two equivalent Bi(5) atoms. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Y(1), one Bi(6), and one Bi(8) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Bi(2), one Bi(5), one Bi(7), and one Bi(9) atom. In the seventh O site, O(7) is bonded to one Bi(1), one Bi(11), one Bi(4), and one Bi(6) atom to form distorted OBi4 tetrahedra that share  a cornercorner with one O(14)Bi4 tetrahedra,  a cornercorner with one O(2)Bi4 tetrahedra, corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, and  an edgeedge with one O(1)YBi3 tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Bi(10), one Bi(3), one Bi(5), and one Bi(7) atom. In the ninth O site, O(9) is bonded to one Y(1), one Bi(5), one Bi(7), and one Bi(8) atom to form distorted OYBi3 tetrahedra that share  a cornercorner with one O(3)Bi4 tetrahedra,  a cornercorner with one O(1)YBi3 tetrahedra, corners with two equivalent O(9)YBi3 tetrahedra, and  an edgeedge with one O(14)Bi4 tetrahedra. In the tenth O site, O(10) is bonded to one Bi(2), one Bi(4), one Bi(6), and one Bi(9) atom to form distorted OBi4 tetrahedra that share  a cornercorner with one O(3)Bi4 tetrahedra,  a cornercorner with one O(1)YBi3 tetrahedra, corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, and  an edgeedge with one O(2)Bi4 tetrahedra. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(11), one Bi(5), and one Bi(7) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Bi(10), one Bi(3), one Bi(4), and one Bi(6) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Bi(10), one Bi(9), and two equivalent Bi(6) atoms. In the fourteenth O site, O(14) is bonded to one Bi(11), one Bi(8), and two equivalent Bi(7) atoms to form distorted OBi4 tetrahedra that share corners with two equivalent O(7)Bi4 tetrahedra and edges with two equivalent O(9)YBi3 tetrahedra. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Bi(11), one Bi(8), and two equivalent Bi(6) atoms. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Bi(10), one Bi(9), and two equivalent Bi(7) atoms.
Bi15YO24 crystallizes in the monoclinic Pm space group. Y(1) is bonded to one O(1), one O(4), two equivalent O(5), and two equivalent O(9) atoms to form distorted YO6 pentagonal pyramids that share edges with two equivalent Bi(8)O6 pentagonal pyramids. The Y(1)-O(1) bond length is 2.14 Å. The Y(1)-O(4) bond length is 2.41 Å. Both Y(1)-O(5) bond lengths are 2.24 Å. Both Y(1)-O(9) bond lengths are 2.48 Å. There are eleven inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 3-coordinate geometry to one O(1), two equivalent O(11), and two equivalent O(7) atoms. The Bi(1)-O(1) bond length is 2.11 Å. Both Bi(1)-O(11) bond lengths are 2.74 Å. Both Bi(1)-O(7) bond lengths are 2.20 Å. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(10), and two equivalent O(6) atoms. The Bi(2)-O(2) bond length is 2.62 Å. The Bi(2)-O(3) bond length is 2.15 Å. Both Bi(2)-O(10) bond lengths are 2.70 Å. Both Bi(2)-O(6) bond lengths are 2.22 Å. In the third Bi site, Bi(3) is bonded in a 6-coordinate geometry to one O(2), one O(3), two equivalent O(12), and two equivalent O(8) atoms. The Bi(3)-O(2) bond length is 2.68 Å. The Bi(3)-O(3) bond length is 2.15 Å. Both Bi(3)-O(12) bond lengths are 2.68 Å. Both Bi(3)-O(8) bond lengths are 2.22 Å. In the fourth Bi site, Bi(4) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(12), one O(2), and one O(7) atom. The Bi(4)-O(1) bond length is 2.61 Å. The Bi(4)-O(10) bond length is 2.23 Å. The Bi(4)-O(12) bond length is 2.18 Å. The Bi(4)-O(2) bond length is 2.14 Å. The Bi(4)-O(7) bond length is 2.72 Å. In the fifth Bi site, Bi(5) is bonded in a 6-coordinate geometry to one O(11), one O(3), one O(4), one O(6), one O(8), and one O(9) atom. The Bi(5)-O(11) bond length is 2.22 Å. The Bi(5)-O(3) bond length is 2.67 Å. The Bi(5)-O(4) bond length is 2.13 Å. The Bi(5)-O(6) bond length is 2.75 Å. The Bi(5)-O(8) bond length is 2.75 Å. The Bi(5)-O(9) bond length is 2.22 Å. In the sixth Bi site, Bi(6) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(13), one O(15), one O(5), and one O(7) atom. The Bi(6)-O(10) bond length is 2.67 Å. The Bi(6)-O(12) bond length is 2.86 Å. The Bi(6)-O(13) bond length is 2.72 Å. The Bi(6)-O(15) bond length is 2.14 Å. The Bi(6)-O(5) bond length is 2.16 Å. The Bi(6)-O(7) bond length is 2.22 Å. In the seventh Bi site, Bi(7) is bonded in a 6-coordinate geometry to one O(11), one O(14), one O(16), one O(6), one O(8), and one O(9) atom. The Bi(7)-O(11) bond length is 2.75 Å. The Bi(7)-O(14) bond length is 2.67 Å. The Bi(7)-O(16) bond length is 2.13 Å. The Bi(7)-O(6) bond length is 2.21 Å. The Bi(7)-O(8) bond length is 2.21 Å. The Bi(7)-O(9) bond length is 2.75 Å. In the eighth Bi site, Bi(8) is bonded to one O(14), one O(15), two equivalent O(5), and two equivalent O(9) atoms to form distorted BiO6 pentagonal pyramids that share edges with two equivalent Y(1)O6 pentagonal pyramids. The Bi(8)-O(14) bond length is 2.14 Å. The Bi(8)-O(15) bond length is 2.51 Å. Both Bi(8)-O(5) bond lengths are 2.60 Å. Both Bi(8)-O(9) bond lengths are 2.33 Å. In the ninth Bi site, Bi(9) is bonded in a 6-coordinate geometry to one O(13), one O(16), two equivalent O(10), and two equivalent O(6) atoms. The Bi(9)-O(13) bond length is 2.14 Å. The Bi(9)-O(16) bond length is 2.66 Å. Both Bi(9)-O(10) bond lengths are 2.23 Å. Both Bi(9)-O(6) bond lengths are 2.68 Å. In the tenth Bi site, Bi(10) is bonded in a 6-coordinate geometry to one O(13), one O(16), two equivalent O(12), and two equivalent O(8) atoms. The Bi(10)-O(13) bond length is 2.14 Å. The Bi(10)-O(16) bond length is 2.71 Å. Both Bi(10)-O(12) bond lengths are 2.22 Å. Both Bi(10)-O(8) bond lengths are 2.69 Å. In the eleventh Bi site, Bi(11) is bonded in a 6-coordinate geometry to one O(14), one O(15), two equivalent O(11), and two equivalent O(7) atoms. The Bi(11)-O(14) bond length is 2.15 Å. The Bi(11)-O(15) bond length is 2.76 Å. Both Bi(11)-O(11) bond lengths are 2.21 Å. Both Bi(11)-O(7) bond lengths are 2.67 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Bi(1), and two equivalent Bi(4) atoms to form distorted OYBi3 tetrahedra that share corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(9)YBi3 tetrahedra,  an edgeedge with one O(2)Bi4 tetrahedra, and edges with two equivalent O(7)Bi4 tetrahedra. In the second O site, O(2) is bonded to one Bi(2), one Bi(3), and two equivalent Bi(4) atoms to form distorted OBi4 tetrahedra that share corners with two equivalent O(7)Bi4 tetrahedra,  an edgeedge with one O(3)Bi4 tetrahedra,  an edgeedge with one O(1)YBi3 tetrahedra, and edges with two equivalent O(10)Bi4 tetrahedra. In the third O site, O(3) is bonded to one Bi(2), one Bi(3), and two equivalent Bi(5) atoms to form distorted OBi4 tetrahedra that share corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(9)YBi3 tetrahedra, and  an edgeedge with one O(2)Bi4 tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1) and two equivalent Bi(5) atoms. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Y(1), one Bi(6), and one Bi(8) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Bi(2), one Bi(5), one Bi(7), and one Bi(9) atom. In the seventh O site, O(7) is bonded to one Bi(1), one Bi(11), one Bi(4), and one Bi(6) atom to form distorted OBi4 tetrahedra that share  a cornercorner with one O(14)Bi4 tetrahedra,  a cornercorner with one O(2)Bi4 tetrahedra, corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, and  an edgeedge with one O(1)YBi3 tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Bi(10), one Bi(3), one Bi(5), and one Bi(7) atom. In the ninth O site, O(9) is bonded to one Y(1), one Bi(5), one Bi(7), and one Bi(8) atom to form distorted OYBi3 tetrahedra that share  a cornercorner with one O(3)Bi4 tetrahedra,  a cornercorner with one O(1)YBi3 tetrahedra, corners with two equivalent O(9)YBi3 tetrahedra, and  an edgeedge with one O(14)Bi4 tetrahedra. In the tenth O site, O(10) is bonded to one Bi(2), one Bi(4), one Bi(6), and one Bi(9) atom to form distorted OBi4 tetrahedra that share  a cornercorner with one O(3)Bi4 tetrahedra,  a cornercorner with one O(1)YBi3 tetrahedra, corners with two equivalent O(10)Bi4 tetrahedra, corners with two equivalent O(7)Bi4 tetrahedra, and  an edgeedge with one O(2)Bi4 tetrahedra. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Bi(1), one Bi(11), one Bi(5), and one Bi(7) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Bi(10), one Bi(3), one Bi(4), and one Bi(6) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Bi(10), one Bi(9), and two equivalent Bi(6) atoms. In the fourteenth O site, O(14) is bonded to one Bi(11), one Bi(8), and two equivalent Bi(7) atoms to form distorted OBi4 tetrahedra that share corners with two equivalent O(7)Bi4 tetrahedra and edges with two equivalent O(9)YBi3 tetrahedra. In the fifteenth O site, O(15) is bonded in a 4-coordinate geometry to one Bi(11), one Bi(8), and two equivalent Bi(6) atoms. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Bi(10), one Bi(9), and two equivalent Bi(7) atoms.