MgSm4Ti2Mn2O12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(2), one O(7), one O(8), and one O(9) atom to form distorted MgO5 square pyramids that share corners with two equivalent Ti(2)O6 octahedra and  a faceface with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 30-72°. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(7) atom. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(7), one O(8), and one O(9) atom. In the third Sm site, Sm(3) is bonded in a 6-coordinate geometry to one O(11), one O(3), one O(4), one O(5), one O(6), and one O(9) atom. In the fourth Sm site, Sm(4) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(10), one O(12), one O(2), one O(4), one O(5), and one O(7) atom to form distorted TiO6 octahedra that share  a faceface with one Mg(1)O5 square pyramid. In the second Ti site, Ti(2) is bonded to one O(1), one O(11), one O(3), one O(6), one O(8), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted see-saw-like geometry to one O(1), one O(12), one O(3), and one O(7) atom. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(4), one O(6), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1), one Sm(2), one Ti(2), and one Mn(1) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(3)Sm2TiMn tetrahedra, corners with two equivalent O(9)Sm2MgTiMn trigonal bipyramids, and  an edgeedge with one O(12)Sm2TiMn tetrahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Mg(1), one Sm(1), one Sm(2), one Ti(1), and one Mn(2) atom. In the third O site, O(3) is bonded to one Sm(3), one Sm(4), one Ti(2), and one Mn(1) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(1)Sm2TiMn tetrahedra, corners with two equivalent O(12)Sm2TiMn tetrahedra, corners with two equivalent O(4)Sm2TiMn tetrahedra, and  an edgeedge with one O(9)Sm2MgTiMn trigonal bipyramid. In the fourth O site, O(4) is bonded to one Sm(3), one Sm(4), one Ti(1), and one Mn(2) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(12)Sm2TiMn tetrahedra, corners with two equivalent O(3)Sm2TiMn tetrahedra, and  an edgeedge with one O(9)Sm2MgTiMn trigonal bipyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Sm(4), and one Ti(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sm(3), one Sm(4), one Ti(2), and one Mn(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Mg(1), one Sm(1), one Sm(2), one Ti(1), and one Mn(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Sm(2), one Sm(4), and one Ti(2) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Sm(2), one Sm(3), one Ti(2), and one Mn(2) atom to form a mixture of distorted corner and edge-sharing OSm2MgTiMn trigonal bipyramids. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mg(1), one Sm(2), and one Ti(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sm(3), one Sm(4), one Ti(2), and one Mn(2) atom. In the twelfth O site, O(12) is bonded to one Sm(2), one Sm(4), one Ti(1), and one Mn(1) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(3)Sm2TiMn tetrahedra, corners with two equivalent O(4)Sm2TiMn tetrahedra,  a cornercorner with one O(9)Sm2MgTiMn trigonal bipyramid, and  an edgeedge with one O(1)Sm2TiMn tetrahedra.
MgSm4Ti2Mn2O12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(2), one O(7), one O(8), and one O(9) atom to form distorted MgO5 square pyramids that share corners with two equivalent Ti(2)O6 octahedra and  a faceface with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 30-72°. The Mg(1)-O(10) bond length is 2.10 Å. The Mg(1)-O(2) bond length is 1.93 Å. The Mg(1)-O(7) bond length is 2.30 Å. The Mg(1)-O(8) bond length is 1.98 Å. The Mg(1)-O(9) bond length is 2.02 Å. There are four inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(7) atom. The Sm(1)-O(1) bond length is 2.25 Å. The Sm(1)-O(2) bond length is 2.18 Å. The Sm(1)-O(5) bond length is 2.21 Å. The Sm(1)-O(7) bond length is 2.32 Å. In the second Sm site, Sm(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(7), one O(8), and one O(9) atom. The Sm(2)-O(1) bond length is 2.42 Å. The Sm(2)-O(10) bond length is 2.38 Å. The Sm(2)-O(12) bond length is 2.54 Å. The Sm(2)-O(2) bond length is 2.32 Å. The Sm(2)-O(7) bond length is 2.66 Å. The Sm(2)-O(8) bond length is 2.41 Å. The Sm(2)-O(9) bond length is 2.43 Å. In the third Sm site, Sm(3) is bonded in a 6-coordinate geometry to one O(11), one O(3), one O(4), one O(5), one O(6), and one O(9) atom. The Sm(3)-O(11) bond length is 2.39 Å. The Sm(3)-O(3) bond length is 2.41 Å. The Sm(3)-O(4) bond length is 2.27 Å. The Sm(3)-O(5) bond length is 2.42 Å. The Sm(3)-O(6) bond length is 2.51 Å. The Sm(3)-O(9) bond length is 2.33 Å. In the fourth Sm site, Sm(4) is bonded in a 7-coordinate geometry to one O(11), one O(12), one O(3), one O(4), one O(5), one O(6), and one O(8) atom. The Sm(4)-O(11) bond length is 2.68 Å. The Sm(4)-O(12) bond length is 2.42 Å. The Sm(4)-O(3) bond length is 2.35 Å. The Sm(4)-O(4) bond length is 2.38 Å. The Sm(4)-O(5) bond length is 2.61 Å. The Sm(4)-O(6) bond length is 2.35 Å. The Sm(4)-O(8) bond length is 2.69 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(10), one O(12), one O(2), one O(4), one O(5), and one O(7) atom to form distorted TiO6 octahedra that share  a faceface with one Mg(1)O5 square pyramid. The Ti(1)-O(10) bond length is 2.01 Å. The Ti(1)-O(12) bond length is 1.97 Å. The Ti(1)-O(2) bond length is 2.48 Å. The Ti(1)-O(4) bond length is 1.98 Å. The Ti(1)-O(5) bond length is 2.14 Å. The Ti(1)-O(7) bond length is 2.10 Å. In the second Ti site, Ti(2) is bonded to one O(1), one O(11), one O(3), one O(6), one O(8), and one O(9) atom to form TiO6 octahedra that share corners with two equivalent Mg(1)O5 square pyramids. The Ti(2)-O(1) bond length is 2.26 Å. The Ti(2)-O(11) bond length is 2.04 Å. The Ti(2)-O(3) bond length is 2.32 Å. The Ti(2)-O(6) bond length is 1.96 Å. The Ti(2)-O(8) bond length is 1.98 Å. The Ti(2)-O(9) bond length is 2.29 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted see-saw-like geometry to one O(1), one O(12), one O(3), and one O(7) atom. The Mn(1)-O(1) bond length is 2.17 Å. The Mn(1)-O(12) bond length is 2.19 Å. The Mn(1)-O(3) bond length is 2.07 Å. The Mn(1)-O(7) bond length is 2.12 Å. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(4), one O(6), and one O(9) atom. The Mn(2)-O(11) bond length is 2.12 Å. The Mn(2)-O(2) bond length is 2.15 Å. The Mn(2)-O(4) bond length is 2.12 Å. The Mn(2)-O(6) bond length is 2.03 Å. The Mn(2)-O(9) bond length is 2.43 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Sm(1), one Sm(2), one Ti(2), and one Mn(1) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(3)Sm2TiMn tetrahedra, corners with two equivalent O(9)Sm2MgTiMn trigonal bipyramids, and  an edgeedge with one O(12)Sm2TiMn tetrahedra. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Mg(1), one Sm(1), one Sm(2), one Ti(1), and one Mn(2) atom. In the third O site, O(3) is bonded to one Sm(3), one Sm(4), one Ti(2), and one Mn(1) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(1)Sm2TiMn tetrahedra, corners with two equivalent O(12)Sm2TiMn tetrahedra, corners with two equivalent O(4)Sm2TiMn tetrahedra, and  an edgeedge with one O(9)Sm2MgTiMn trigonal bipyramid. In the fourth O site, O(4) is bonded to one Sm(3), one Sm(4), one Ti(1), and one Mn(2) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(12)Sm2TiMn tetrahedra, corners with two equivalent O(3)Sm2TiMn tetrahedra, and  an edgeedge with one O(9)Sm2MgTiMn trigonal bipyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sm(1), one Sm(3), one Sm(4), and one Ti(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sm(3), one Sm(4), one Ti(2), and one Mn(2) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Mg(1), one Sm(1), one Sm(2), one Ti(1), and one Mn(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one Sm(2), one Sm(4), and one Ti(2) atom. In the ninth O site, O(9) is bonded to one Mg(1), one Sm(2), one Sm(3), one Ti(2), and one Mn(2) atom to form a mixture of distorted corner and edge-sharing OSm2MgTiMn trigonal bipyramids. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mg(1), one Sm(2), and one Ti(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sm(3), one Sm(4), one Ti(2), and one Mn(2) atom. In the twelfth O site, O(12) is bonded to one Sm(2), one Sm(4), one Ti(1), and one Mn(1) atom to form distorted OSm2TiMn tetrahedra that share corners with two equivalent O(3)Sm2TiMn tetrahedra, corners with two equivalent O(4)Sm2TiMn tetrahedra,  a cornercorner with one O(9)Sm2MgTiMn trigonal bipyramid, and  an edgeedge with one O(1)Sm2TiMn tetrahedra.