Er9Ho3(MnBi2)2 crystallizes in the monoclinic Pm space group. There are nine inequivalent Er sites. In the first Er site, Er(1) is bonded in a 4-coordinate geometry to two equivalent Mn(1), one Bi(2), and one Bi(4) atom. In the second Er site, Er(2) is bonded to two equivalent Mn(1), one Bi(1), and one Bi(3) atom to form distorted corner-sharing ErMn2Bi2 tetrahedra. In the third Er site, Er(3) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Bi(2), and one Bi(4) atom. In the fourth Er site, Er(4) is bonded in a 5-coordinate geometry to one Mn(2), two equivalent Bi(1), and two equivalent Bi(4) atoms. In the fifth Er site, Er(5) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(2), and two equivalent Bi(3) atoms. In the sixth Er site, Er(6) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. In the seventh Er site, Er(7) is bonded in a 5-coordinate geometry to one Mn(2), two equivalent Bi(2), and two equivalent Bi(4) atoms. In the eighth Er site, Er(8) is bonded in a 5-coordinate geometry to one Mn(2), two equivalent Bi(1), and two equivalent Bi(3) atoms. In the ninth Er site, Er(9) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(2), and two equivalent Bi(4) atoms. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Bi(1), and one Bi(4) atom. In the second Ho site, Ho(2) is bonded in a 4-coordinate geometry to two equivalent Mn(1), one Bi(2), and one Bi(3) atom. In the third Ho site, Ho(3) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Bi(1), and one Bi(3) atom. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 9-coordinate geometry to one Er(5), one Er(6), one Er(9), two equivalent Er(1), two equivalent Er(2), and two equivalent Ho(2) atoms. In the second Mn site, Mn(2) is bonded in a 9-coordinate geometry to one Er(4), one Er(7), one Er(8), two equivalent Er(3), two equivalent Ho(1), and two equivalent Ho(3) atoms. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one Er(2), two equivalent Er(4), two equivalent Er(6), two equivalent Er(8), one Ho(1), and one Ho(3) atom. In the second Bi site, Bi(2) is bonded in a 9-coordinate geometry to one Er(1), one Er(3), two equivalent Er(5), two equivalent Er(7), two equivalent Er(9), and one Ho(2) atom. In the third Bi site, Bi(3) is bonded in a 9-coordinate geometry to one Er(2), two equivalent Er(5), two equivalent Er(6), two equivalent Er(8), one Ho(2), and one Ho(3) atom. In the fourth Bi site, Bi(4) is bonded in a 9-coordinate geometry to one Er(1), one Er(3), two equivalent Er(4), two equivalent Er(7), two equivalent Er(9), and one Ho(1) atom.
Er9Ho3(MnBi2)2 crystallizes in the monoclinic Pm space group. There are nine inequivalent Er sites. In the first Er site, Er(1) is bonded in a 4-coordinate geometry to two equivalent Mn(1), one Bi(2), and one Bi(4) atom. Both Er(1)-Mn(1) bond lengths are 2.87 Å. The Er(1)-Bi(2) bond length is 3.24 Å. The Er(1)-Bi(4) bond length is 3.23 Å. In the second Er site, Er(2) is bonded to two equivalent Mn(1), one Bi(1), and one Bi(3) atom to form distorted corner-sharing ErMn2Bi2 tetrahedra. Both Er(2)-Mn(1) bond lengths are 2.87 Å. The Er(2)-Bi(1) bond length is 3.23 Å. The Er(2)-Bi(3) bond length is 3.23 Å. In the third Er site, Er(3) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Bi(2), and one Bi(4) atom. Both Er(3)-Mn(2) bond lengths are 2.87 Å. The Er(3)-Bi(2) bond length is 3.23 Å. The Er(3)-Bi(4) bond length is 3.24 Å. In the fourth Er site, Er(4) is bonded in a 5-coordinate geometry to one Mn(2), two equivalent Bi(1), and two equivalent Bi(4) atoms. The Er(4)-Mn(2) bond length is 3.22 Å. Both Er(4)-Bi(1) bond lengths are 3.32 Å. Both Er(4)-Bi(4) bond lengths are 3.32 Å. In the fifth Er site, Er(5) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(2), and two equivalent Bi(3) atoms. The Er(5)-Mn(1) bond length is 3.22 Å. Both Er(5)-Bi(2) bond lengths are 3.32 Å. Both Er(5)-Bi(3) bond lengths are 3.32 Å. In the sixth Er site, Er(6) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Er(6)-Mn(1) bond length is 3.23 Å. Both Er(6)-Bi(1) bond lengths are 3.31 Å. Both Er(6)-Bi(3) bond lengths are 3.32 Å. In the seventh Er site, Er(7) is bonded in a 5-coordinate geometry to one Mn(2), two equivalent Bi(2), and two equivalent Bi(4) atoms. The Er(7)-Mn(2) bond length is 3.22 Å. Both Er(7)-Bi(2) bond lengths are 3.31 Å. Both Er(7)-Bi(4) bond lengths are 3.32 Å. In the eighth Er site, Er(8) is bonded in a 5-coordinate geometry to one Mn(2), two equivalent Bi(1), and two equivalent Bi(3) atoms. The Er(8)-Mn(2) bond length is 3.23 Å. Both Er(8)-Bi(1) bond lengths are 3.32 Å. Both Er(8)-Bi(3) bond lengths are 3.31 Å. In the ninth Er site, Er(9) is bonded in a 5-coordinate geometry to one Mn(1), two equivalent Bi(2), and two equivalent Bi(4) atoms. The Er(9)-Mn(1) bond length is 3.23 Å. Both Er(9)-Bi(2) bond lengths are 3.32 Å. Both Er(9)-Bi(4) bond lengths are 3.31 Å. There are three inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Bi(1), and one Bi(4) atom. Both Ho(1)-Mn(2) bond lengths are 2.87 Å. The Ho(1)-Bi(1) bond length is 3.24 Å. The Ho(1)-Bi(4) bond length is 3.24 Å. In the second Ho site, Ho(2) is bonded in a 4-coordinate geometry to two equivalent Mn(1), one Bi(2), and one Bi(3) atom. Both Ho(2)-Mn(1) bond lengths are 2.87 Å. The Ho(2)-Bi(2) bond length is 3.24 Å. The Ho(2)-Bi(3) bond length is 3.24 Å. In the third Ho site, Ho(3) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Bi(1), and one Bi(3) atom. Both Ho(3)-Mn(2) bond lengths are 2.87 Å. The Ho(3)-Bi(1) bond length is 3.24 Å. The Ho(3)-Bi(3) bond length is 3.24 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 9-coordinate geometry to one Er(5), one Er(6), one Er(9), two equivalent Er(1), two equivalent Er(2), and two equivalent Ho(2) atoms. In the second Mn site, Mn(2) is bonded in a 9-coordinate geometry to one Er(4), one Er(7), one Er(8), two equivalent Er(3), two equivalent Ho(1), and two equivalent Ho(3) atoms. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 9-coordinate geometry to one Er(2), two equivalent Er(4), two equivalent Er(6), two equivalent Er(8), one Ho(1), and one Ho(3) atom. In the second Bi site, Bi(2) is bonded in a 9-coordinate geometry to one Er(1), one Er(3), two equivalent Er(5), two equivalent Er(7), two equivalent Er(9), and one Ho(2) atom. In the third Bi site, Bi(3) is bonded in a 9-coordinate geometry to one Er(2), two equivalent Er(5), two equivalent Er(6), two equivalent Er(8), one Ho(2), and one Ho(3) atom. In the fourth Bi site, Bi(4) is bonded in a 9-coordinate geometry to one Er(1), one Er(3), two equivalent Er(4), two equivalent Er(7), two equivalent Er(9), and one Ho(1) atom.