La3Mn8BiO20 crystallizes in the monoclinic Pm space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(10), two equivalent O(12), and two equivalent O(13) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(11), two equivalent O(14), and two equivalent O(9) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(5), one O(8), two equivalent O(10), two equivalent O(12), and two equivalent O(14) atoms. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), two equivalent O(14), and two equivalent O(9) 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 48-55°. In the second Mn site, Mn(2) is bonded to one O(2), two equivalent O(10), and two equivalent O(14) 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 48-54°. In the third Mn site, Mn(3) is bonded to one O(3), two equivalent O(11), and two equivalent O(13) 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 48-55°. In the fourth Mn site, Mn(4) is bonded to one O(4), two equivalent O(12), and two equivalent O(13) 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 48-54°. In the fifth Mn site, Mn(5) is bonded to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(6) 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(3), one O(4), one O(7), one O(8), 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. Bi(1) is bonded in a 8-coordinate geometry to one O(5), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(9) 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 to one La(3), two equivalent Mn(5), and one Bi(1) atom to form distorted edge-sharing OLaMn2Bi tetrahedra. In the sixth O site, O(6) is bonded to one La(1), one La(2), and two equivalent Mn(5) atoms to form distorted OLa2Mn2 tetrahedra that share corners with two equivalent O(7)La2Mn2 tetrahedra and  an edgeedge with one O(5)LaMn2Bi tetrahedra. In the seventh O site, O(7) is bonded to one La(1), one La(2), and two equivalent Mn(6) atoms to form distorted corner-sharing OLa2Mn2 tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(3), two equivalent Mn(6), and one Bi(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(2), one Mn(1), one Mn(6), and one Bi(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Mn(2), and one Mn(6) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(2), one Mn(3), one Mn(5), and one Bi(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Mn(4), and one Mn(5) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(1), one Mn(3), one Mn(4), and one Bi(1) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(2), one La(3), one Mn(1), and one Mn(2) atom.
La3Mn8BiO20 crystallizes in the monoclinic Pm space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(10), two equivalent O(12), and two equivalent O(13) atoms. The La(1)-O(6) bond length is 2.44 Å. The La(1)-O(7) bond length is 2.51 Å. Both La(1)-O(10) bond lengths are 2.51 Å. Both La(1)-O(12) bond lengths are 2.60 Å. Both La(1)-O(13) bond lengths are 2.48 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(6), one O(7), two equivalent O(11), two equivalent O(14), and two equivalent O(9) atoms. The La(2)-O(6) bond length is 2.51 Å. The La(2)-O(7) bond length is 2.42 Å. Both La(2)-O(11) bond lengths are 2.48 Å. Both La(2)-O(14) bond lengths are 2.50 Å. Both La(2)-O(9) bond lengths are 2.65 Å. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(5), one O(8), two equivalent O(10), two equivalent O(12), and two equivalent O(14) atoms. The La(3)-O(5) bond length is 2.52 Å. The La(3)-O(8) bond length is 2.44 Å. Both La(3)-O(10) bond lengths are 2.61 Å. Both La(3)-O(12) bond lengths are 2.48 Å. Both La(3)-O(14) bond lengths are 2.50 Å. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), two equivalent O(14), and two equivalent O(9) 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 48-55°. The Mn(1)-O(1) bond length is 2.12 Å. Both Mn(1)-O(14) bond lengths are 1.97 Å. Both Mn(1)-O(9) bond lengths are 1.95 Å. In the second Mn site, Mn(2) is bonded to one O(2), two equivalent O(10), and two equivalent O(14) 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 48-54°. The Mn(2)-O(2) bond length is 2.13 Å. Both Mn(2)-O(10) bond lengths are 1.95 Å. Both Mn(2)-O(14) bond lengths are 1.98 Å. In the third Mn site, Mn(3) is bonded to one O(3), two equivalent O(11), and two equivalent O(13) 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 48-55°. The Mn(3)-O(3) bond length is 2.18 Å. Both Mn(3)-O(11) bond lengths are 1.93 Å. Both Mn(3)-O(13) bond lengths are 1.97 Å. In the fourth Mn site, Mn(4) is bonded to one O(4), two equivalent O(12), and two equivalent O(13) 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 48-54°. The Mn(4)-O(4) bond length is 2.12 Å. Both Mn(4)-O(12) bond lengths are 1.94 Å. Both Mn(4)-O(13) bond lengths are 1.97 Å. In the fifth Mn site, Mn(5) is bonded to one O(1), one O(11), one O(12), one O(2), one O(5), and one O(6) 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 1.91 Å. The Mn(5)-O(11) bond length is 1.94 Å. The Mn(5)-O(12) bond length is 1.96 Å. The Mn(5)-O(2) bond length is 1.92 Å. The Mn(5)-O(5) bond length is 1.98 Å. The Mn(5)-O(6) bond length is 1.97 Å. In the sixth Mn site, Mn(6) is bonded to one O(10), one O(3), one O(4), one O(7), one O(8), 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 1.95 Å. The Mn(6)-O(3) bond length is 1.92 Å. The Mn(6)-O(4) bond length is 1.92 Å. The Mn(6)-O(7) bond length is 1.97 Å. The Mn(6)-O(8) bond length is 1.98 Å. The Mn(6)-O(9) bond length is 1.96 Å. Bi(1) is bonded in a 8-coordinate geometry to one O(5), one O(8), two equivalent O(11), two equivalent O(13), and two equivalent O(9) atoms. The Bi(1)-O(5) bond length is 2.41 Å. The Bi(1)-O(8) bond length is 2.45 Å. Both Bi(1)-O(11) bond lengths are 2.65 Å. Both Bi(1)-O(13) bond lengths are 2.50 Å. Both Bi(1)-O(9) bond lengths are 2.41 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 to one La(3), two equivalent Mn(5), and one Bi(1) atom to form distorted edge-sharing OLaMn2Bi tetrahedra. In the sixth O site, O(6) is bonded to one La(1), one La(2), and two equivalent Mn(5) atoms to form distorted OLa2Mn2 tetrahedra that share corners with two equivalent O(7)La2Mn2 tetrahedra and  an edgeedge with one O(5)LaMn2Bi tetrahedra. In the seventh O site, O(7) is bonded to one La(1), one La(2), and two equivalent Mn(6) atoms to form distorted corner-sharing OLa2Mn2 tetrahedra. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one La(3), two equivalent Mn(6), and one Bi(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one La(2), one Mn(1), one Mn(6), and one Bi(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Mn(2), and one Mn(6) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one La(2), one Mn(3), one Mn(5), and one Bi(1) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one La(1), one La(3), one Mn(4), and one Mn(5) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one La(1), one Mn(3), one Mn(4), and one Bi(1) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(2), one La(3), one Mn(1), and one Mn(2) atom.