LaMn8Bi3O20 crystallizes in the monoclinic Pm space group. La(1) is bonded in a 8-coordinate geometry to one O(10), one O(7), two equivalent O(11), two equivalent O(13), and two equivalent O(5) atoms. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), two equivalent O(11), and two equivalent O(6) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-56°. In the second Mn site, Mn(2) is bonded to one O(2), two equivalent O(12), and two equivalent O(6) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-57°. In the third Mn site, Mn(3) is bonded to one O(3), two equivalent O(13), and two equivalent O(5) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-57°. In the fourth Mn site, Mn(4) is bonded to one O(4), two equivalent O(14), and two equivalent O(5) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-57°. In the fifth Mn site, Mn(5) is bonded to one O(1), one O(13), one O(14), one O(2), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Mn(3)O5 square pyramid,  a cornercorner with one Mn(4)O5 square pyramid, and edges with two equivalent Mn(5)O6 octahedra. In the sixth Mn site, Mn(6) is bonded to one O(10), one O(11), one O(12), one O(3), one O(4), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Mn(3)O5 square pyramid,  a cornercorner with one Mn(4)O5 square pyramid, and edges with two equivalent Mn(6)O6 octahedra. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to one O(8), one O(9), two equivalent O(12), two equivalent O(14), and two equivalent O(5) atoms. In the second Bi site, Bi(2) is bonded in a 8-coordinate geometry to one O(8), one O(9), two equivalent O(11), two equivalent O(13), and two equivalent O(6) atoms. In the third Bi site, Bi(3) is bonded in a 8-coordinate geometry to one O(10), one O(7), two equivalent O(12), two equivalent O(14), and two equivalent O(6) atoms. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(5) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(2) and two equivalent Mn(5) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(3) and two equivalent Mn(6) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(4) and two equivalent Mn(6) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one Mn(3), one Mn(4), and one Bi(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Bi(2), and one Bi(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(1), two equivalent Mn(5), and one Bi(3) atom. In the eighth O site, O(8) is bonded in a distorted tetrahedral geometry to two equivalent Mn(5), one Bi(1), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent Mn(6), one Bi(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a distorted tetrahedral geometry to one La(1), two equivalent Mn(6), and one Bi(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(1), one Mn(1), one Mn(6), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(6), one Bi(1), and one Bi(3) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(1), one Mn(3), one Mn(5), and one Bi(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Mn(4), one Mn(5), one Bi(1), and one Bi(3) atom.
LaMn8Bi3O20 crystallizes in the monoclinic Pm space group. La(1) is bonded in a 8-coordinate geometry to one O(10), one O(7), two equivalent O(11), two equivalent O(13), and two equivalent O(5) atoms. The La(1)-O(10) bond length is 2.51 Å. The La(1)-O(7) bond length is 2.43 Å. Both La(1)-O(11) bond lengths are 2.45 Å. Both La(1)-O(13) bond lengths are 2.67 Å. Both La(1)-O(5) bond lengths are 2.47 Å. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), two equivalent O(11), and two equivalent O(6) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-56°. The Mn(1)-O(1) bond length is 2.13 Å. Both Mn(1)-O(11) bond lengths are 1.93 Å. Both Mn(1)-O(6) bond lengths are 1.97 Å. In the second Mn site, Mn(2) is bonded to one O(2), two equivalent O(12), and two equivalent O(6) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-57°. The Mn(2)-O(2) bond length is 2.11 Å. Both Mn(2)-O(12) bond lengths are 1.95 Å. Both Mn(2)-O(6) bond lengths are 1.96 Å. In the third Mn site, Mn(3) is bonded to one O(3), two equivalent O(13), and two equivalent O(5) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-57°. The Mn(3)-O(3) bond length is 2.07 Å. Both Mn(3)-O(13) bond lengths are 1.96 Å. Both Mn(3)-O(5) bond lengths are 1.96 Å. In the fourth Mn site, Mn(4) is bonded to one O(4), two equivalent O(14), and two equivalent O(5) atoms to form MnO5 square pyramids that share corners with two equivalent Mn(5)O6 octahedra, corners with two equivalent Mn(6)O6 octahedra, and  an edgeedge with one Mn(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 49-57°. The Mn(4)-O(4) bond length is 2.12 Å. Both Mn(4)-O(14) bond lengths are 1.95 Å. Both Mn(4)-O(5) bond lengths are 1.96 Å. In the fifth Mn site, Mn(5) is bonded to one O(1), one O(13), one O(14), one O(2), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Mn(3)O5 square pyramid,  a cornercorner with one Mn(4)O5 square pyramid, and edges with two equivalent Mn(5)O6 octahedra. The Mn(5)-O(1) bond length is 1.92 Å. The Mn(5)-O(13) bond length is 1.96 Å. The Mn(5)-O(14) bond length is 1.94 Å. The Mn(5)-O(2) bond length is 1.91 Å. The Mn(5)-O(7) bond length is 1.98 Å. The Mn(5)-O(8) bond length is 1.99 Å. In the sixth Mn site, Mn(6) is bonded to one O(10), one O(11), one O(12), one O(3), one O(4), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Mn(3)O5 square pyramid,  a cornercorner with one Mn(4)O5 square pyramid, and edges with two equivalent Mn(6)O6 octahedra. The Mn(6)-O(10) bond length is 1.98 Å. The Mn(6)-O(11) bond length is 1.93 Å. The Mn(6)-O(12) bond length is 1.96 Å. The Mn(6)-O(3) bond length is 1.91 Å. The Mn(6)-O(4) bond length is 1.92 Å. The Mn(6)-O(9) bond length is 1.99 Å. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 8-coordinate geometry to one O(8), one O(9), two equivalent O(12), two equivalent O(14), and two equivalent O(5) atoms. The Bi(1)-O(8) bond length is 2.40 Å. The Bi(1)-O(9) bond length is 2.40 Å. Both Bi(1)-O(12) bond lengths are 2.30 Å. Both Bi(1)-O(14) bond lengths are 2.79 Å. Both Bi(1)-O(5) bond lengths are 2.52 Å. In the second Bi site, Bi(2) is bonded in a 8-coordinate geometry to one O(8), one O(9), two equivalent O(11), two equivalent O(13), and two equivalent O(6) atoms. The Bi(2)-O(8) bond length is 2.42 Å. The Bi(2)-O(9) bond length is 2.42 Å. Both Bi(2)-O(11) bond lengths are 2.73 Å. Both Bi(2)-O(13) bond lengths are 2.36 Å. Both Bi(2)-O(6) bond lengths are 2.48 Å. In the third Bi site, Bi(3) is bonded in a 8-coordinate geometry to one O(10), one O(7), two equivalent O(12), two equivalent O(14), and two equivalent O(6) atoms. The Bi(3)-O(10) bond length is 2.39 Å. The Bi(3)-O(7) bond length is 2.40 Å. Both Bi(3)-O(12) bond lengths are 2.76 Å. Both Bi(3)-O(14) bond lengths are 2.34 Å. Both Bi(3)-O(6) bond lengths are 2.50 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(5) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(2) and two equivalent Mn(5) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(3) and two equivalent Mn(6) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(4) and two equivalent Mn(6) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one La(1), one Mn(3), one Mn(4), and one Bi(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(2), one Bi(2), and one Bi(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one La(1), two equivalent Mn(5), and one Bi(3) atom. In the eighth O site, O(8) is bonded in a distorted tetrahedral geometry to two equivalent Mn(5), one Bi(1), and one Bi(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to two equivalent Mn(6), one Bi(1), and one Bi(2) atom. In the tenth O site, O(10) is bonded in a distorted tetrahedral geometry to one La(1), two equivalent Mn(6), and one Bi(3) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(1), one Mn(1), one Mn(6), and one Bi(2) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(6), one Bi(1), and one Bi(3) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(1), one Mn(3), one Mn(5), and one Bi(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Mn(4), one Mn(5), one Bi(1), and one Bi(3) atom.