BiMn7O12 crystallizes in the monoclinic Cm space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second Mn site, Mn(2) is bonded in a distorted square co-planar geometry to two equivalent O(5) and two equivalent O(7) atoms. In the third Mn site, Mn(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(6) and two equivalent O(8) atoms. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 40-48°. In the fifth Mn site, Mn(5) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 40-44°. Bi(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(1) and two equivalent Mn(4) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1) and two equivalent Mn(5) atoms. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Mn(1), two equivalent Mn(4), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(1), two equivalent Mn(5), and one Bi(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), one Mn(5), and one Bi(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mn(3), one Mn(4), one Mn(5), and one Bi(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(4), one Mn(5), and one Bi(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one Mn(5) atom.
BiMn7O12 crystallizes in the monoclinic Cm space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Mn(1)-O(1) bond length is 1.96 Å. The Mn(1)-O(2) bond length is 1.96 Å. The Mn(1)-O(3) bond length is 2.00 Å. The Mn(1)-O(4) bond length is 1.97 Å. In the second Mn site, Mn(2) is bonded in a distorted square co-planar geometry to two equivalent O(5) and two equivalent O(7) atoms. Both Mn(2)-O(5) bond lengths are 1.96 Å. Both Mn(2)-O(7) bond lengths are 1.96 Å. In the third Mn site, Mn(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(6) and two equivalent O(8) atoms. Both Mn(3)-O(6) bond lengths are 1.97 Å. Both Mn(3)-O(8) bond lengths are 1.95 Å. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 40-48°. The Mn(4)-O(1) bond length is 1.99 Å. The Mn(4)-O(3) bond length is 2.06 Å. The Mn(4)-O(5) bond length is 1.94 Å. The Mn(4)-O(6) bond length is 2.15 Å. The Mn(4)-O(7) bond length is 1.97 Å. The Mn(4)-O(8) bond length is 2.07 Å. In the fifth Mn site, Mn(5) is bonded to one O(2), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 40-44°. The Mn(5)-O(2) bond length is 2.01 Å. The Mn(5)-O(4) bond length is 2.02 Å. The Mn(5)-O(5) bond length is 2.12 Å. The Mn(5)-O(6) bond length is 1.99 Å. The Mn(5)-O(7) bond length is 2.15 Å. The Mn(5)-O(8) bond length is 1.95 Å. Bi(1) is bonded in a 8-coordinate geometry to one O(3), one O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. The Bi(1)-O(3) bond length is 2.36 Å. The Bi(1)-O(4) bond length is 2.71 Å. Both Bi(1)-O(5) bond lengths are 2.76 Å. Both Bi(1)-O(6) bond lengths are 2.45 Å. Both Bi(1)-O(7) bond lengths are 2.61 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(1) and two equivalent Mn(4) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1) and two equivalent Mn(5) atoms. In the third O site, O(3) is bonded in a distorted tetrahedral geometry to one Mn(1), two equivalent Mn(4), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(1), two equivalent Mn(5), and one Bi(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), one Mn(5), and one Bi(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mn(3), one Mn(4), one Mn(5), and one Bi(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(4), one Mn(5), and one Bi(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one Mn(5) atom.