Sr8MgMn6O20 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(15), one O(18), one O(7), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(16), one O(4), one O(7), one O(8), and two equivalent O(19) atoms. In the third Sr site, Sr(3) is bonded in a 5-coordinate geometry to one O(10), one O(14), one O(18), one O(2), and one O(20) atom. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(17), one O(19), one O(4), one O(6), one O(9), and two equivalent O(13) atoms. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(1), one O(13), one O(16), one O(4), one O(5), one O(6), one O(9), and two equivalent O(17) atoms. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to one O(14), one O(2), one O(20), one O(5), one O(6), and one O(9) atom. In the seventh Sr site, Sr(7) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(18), one O(2), one O(3), one O(7), one O(8), and two equivalent O(15) atoms. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(19), one O(4), one O(7), and two equivalent O(16) atoms. Mg(1) is bonded to one O(15), one O(2), one O(20), and one O(3) atom to form distorted MgO4 trigonal pyramids that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-57°. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(13), one O(17), one O(4), one O(6), and one O(9) atom to form a mixture of corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-17°. In the second Mn site, Mn(2) is bonded to one O(10), one O(14), one O(2), one O(20), one O(3), and one O(5) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mg(1)O4 trigonal pyramid,  an edgeedge with one Mg(1)O4 trigonal pyramid, and  a faceface with one Mn(5)O6 octahedra. In the third Mn site, Mn(3) is bonded in a 5-coordinate geometry to one O(11), one O(15), one O(18), one O(3), and one O(8) atom. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(12), one O(16), one O(19), one O(4), and one O(7) atom to form a mixture of distorted corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-17°. In the fifth Mn site, Mn(5) is bonded to one O(10), one O(17), one O(20), one O(5), one O(6), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Mg(1)O4 trigonal pyramid,  a faceface with one Mn(1)O6 octahedra, and  a faceface with one Mn(2)O6 octahedra. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(12), one O(15), one O(16), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Mg(1)O4 trigonal pyramid and  a faceface with one Mn(4)O6 octahedra. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), one Sr(8), one Mn(1), and one Mn(4) atom. In the second O site, O(2) is bonded to one Sr(3), one Sr(6), one Sr(7), one Mg(1), and one Mn(2) atom to form distorted OSr3MgMn trigonal bipyramids that share  a cornercorner with one O(6)Sr3Mn2 square pyramid and corners with two equivalent O(18)Sr3Mn tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(7), one Mg(1), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), one Sr(8), one Mn(1), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(5), one Sr(6), one Mn(2), and one Mn(5) atom. In the sixth O site, O(6) is bonded to one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom to form distorted corner-sharing OSr3Mn2 square pyramids. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Sr(8), one Mn(4), and one Mn(6) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Mn(3), and one Mn(6) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Sr(3), one Mn(2), and one Mn(5) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Sr(8), one Mn(3), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Sr(8), one Mn(4), and one Mn(6) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(5), two equivalent Sr(4), and one Mn(1) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(3), one Sr(6), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Sr(7), one Mg(1), one Mn(3), and one Mn(6) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(5), two equivalent Sr(8), one Mn(4), and one Mn(6) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(5), one Mn(1), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(3), one Sr(7), and one Mn(3) atom to form distorted corner-sharing OSr3Mn tetrahedra. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Sr(4), one Sr(8), two equivalent Sr(2), and one Mn(4) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(6), one Mg(1), one Mn(2), and one Mn(5) atom.
Sr8MgMn6O20 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. There are eight inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(15), one O(18), one O(7), and one O(8) atom. The Sr(1)-O(11) bond length is 2.70 Å. The Sr(1)-O(12) bond length is 2.51 Å. The Sr(1)-O(15) bond length is 2.47 Å. The Sr(1)-O(18) bond length is 2.56 Å. The Sr(1)-O(7) bond length is 2.64 Å. The Sr(1)-O(8) bond length is 2.41 Å. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(16), one O(4), one O(7), one O(8), and two equivalent O(19) atoms. The Sr(2)-O(1) bond length is 2.83 Å. The Sr(2)-O(11) bond length is 3.15 Å. The Sr(2)-O(12) bond length is 2.64 Å. The Sr(2)-O(13) bond length is 2.62 Å. The Sr(2)-O(16) bond length is 2.49 Å. The Sr(2)-O(4) bond length is 2.86 Å. The Sr(2)-O(7) bond length is 2.97 Å. The Sr(2)-O(8) bond length is 2.94 Å. There is one shorter (2.83 Å) and one longer (2.93 Å) Sr(2)-O(19) bond length. In the third Sr site, Sr(3) is bonded in a 5-coordinate geometry to one O(10), one O(14), one O(18), one O(2), and one O(20) atom. The Sr(3)-O(10) bond length is 2.40 Å. The Sr(3)-O(14) bond length is 2.38 Å. The Sr(3)-O(18) bond length is 2.45 Å. The Sr(3)-O(2) bond length is 2.60 Å. The Sr(3)-O(20) bond length is 2.63 Å. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(1), one O(17), one O(19), one O(4), one O(6), one O(9), and two equivalent O(13) atoms. The Sr(4)-O(1) bond length is 2.81 Å. The Sr(4)-O(17) bond length is 2.49 Å. The Sr(4)-O(19) bond length is 2.52 Å. The Sr(4)-O(4) bond length is 2.75 Å. The Sr(4)-O(6) bond length is 2.55 Å. The Sr(4)-O(9) bond length is 2.93 Å. There is one shorter (2.77 Å) and one longer (2.96 Å) Sr(4)-O(13) bond length. In the fifth Sr site, Sr(5) is bonded in a 9-coordinate geometry to one O(1), one O(13), one O(16), one O(4), one O(5), one O(6), one O(9), and two equivalent O(17) atoms. The Sr(5)-O(1) bond length is 2.78 Å. The Sr(5)-O(13) bond length is 2.42 Å. The Sr(5)-O(16) bond length is 3.10 Å. The Sr(5)-O(4) bond length is 2.57 Å. The Sr(5)-O(5) bond length is 2.71 Å. The Sr(5)-O(6) bond length is 2.78 Å. The Sr(5)-O(9) bond length is 2.66 Å. There is one shorter (2.70 Å) and one longer (3.01 Å) Sr(5)-O(17) bond length. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to one O(14), one O(2), one O(20), one O(5), one O(6), and one O(9) atom. The Sr(6)-O(14) bond length is 2.45 Å. The Sr(6)-O(2) bond length is 2.62 Å. The Sr(6)-O(20) bond length is 2.77 Å. The Sr(6)-O(5) bond length is 2.52 Å. The Sr(6)-O(6) bond length is 2.45 Å. The Sr(6)-O(9) bond length is 2.36 Å. In the seventh Sr site, Sr(7) is bonded in a 9-coordinate geometry to one O(11), one O(12), one O(18), one O(2), one O(3), one O(7), one O(8), and two equivalent O(15) atoms. The Sr(7)-O(11) bond length is 2.60 Å. The Sr(7)-O(12) bond length is 3.19 Å. The Sr(7)-O(18) bond length is 2.49 Å. The Sr(7)-O(2) bond length is 2.75 Å. The Sr(7)-O(3) bond length is 2.70 Å. The Sr(7)-O(7) bond length is 2.62 Å. The Sr(7)-O(8) bond length is 2.85 Å. There is one shorter (2.68 Å) and one longer (3.01 Å) Sr(7)-O(15) bond length. In the eighth Sr site, Sr(8) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(19), one O(4), one O(7), and two equivalent O(16) atoms. The Sr(8)-O(1) bond length is 2.64 Å. The Sr(8)-O(11) bond length is 2.69 Å. The Sr(8)-O(12) bond length is 2.68 Å. The Sr(8)-O(19) bond length is 2.43 Å. The Sr(8)-O(4) bond length is 2.75 Å. The Sr(8)-O(7) bond length is 2.57 Å. There is one shorter (2.84 Å) and one longer (2.85 Å) Sr(8)-O(16) bond length. Mg(1) is bonded to one O(15), one O(2), one O(20), and one O(3) atom to form distorted MgO4 trigonal pyramids that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-57°. The Mg(1)-O(15) bond length is 1.96 Å. The Mg(1)-O(2) bond length is 2.03 Å. The Mg(1)-O(20) bond length is 2.09 Å. The Mg(1)-O(3) bond length is 1.99 Å. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(13), one O(17), one O(4), one O(6), and one O(9) atom to form a mixture of corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-17°. The Mn(1)-O(1) bond length is 1.91 Å. The Mn(1)-O(13) bond length is 1.88 Å. The Mn(1)-O(17) bond length is 2.10 Å. The Mn(1)-O(4) bond length is 1.88 Å. The Mn(1)-O(6) bond length is 2.02 Å. The Mn(1)-O(9) bond length is 1.98 Å. In the second Mn site, Mn(2) is bonded to one O(10), one O(14), one O(2), one O(20), one O(3), and one O(5) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mg(1)O4 trigonal pyramid,  an edgeedge with one Mg(1)O4 trigonal pyramid, and  a faceface with one Mn(5)O6 octahedra. The Mn(2)-O(10) bond length is 1.99 Å. The Mn(2)-O(14) bond length is 1.86 Å. The Mn(2)-O(2) bond length is 2.03 Å. The Mn(2)-O(20) bond length is 2.14 Å. The Mn(2)-O(3) bond length is 1.93 Å. The Mn(2)-O(5) bond length is 1.93 Å. In the third Mn site, Mn(3) is bonded in a 5-coordinate geometry to one O(11), one O(15), one O(18), one O(3), and one O(8) atom. The Mn(3)-O(11) bond length is 1.99 Å. The Mn(3)-O(15) bond length is 2.44 Å. The Mn(3)-O(18) bond length is 1.86 Å. The Mn(3)-O(3) bond length is 1.92 Å. The Mn(3)-O(8) bond length is 1.92 Å. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(12), one O(16), one O(19), one O(4), and one O(7) atom to form a mixture of distorted corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-17°. The Mn(4)-O(1) bond length is 1.94 Å. The Mn(4)-O(12) bond length is 2.03 Å. The Mn(4)-O(16) bond length is 2.02 Å. The Mn(4)-O(19) bond length is 1.89 Å. The Mn(4)-O(4) bond length is 2.05 Å. The Mn(4)-O(7) bond length is 2.30 Å. In the fifth Mn site, Mn(5) is bonded to one O(10), one O(17), one O(20), one O(5), one O(6), and one O(9) atom to form MnO6 octahedra that share  a cornercorner with one Mg(1)O4 trigonal pyramid,  a faceface with one Mn(1)O6 octahedra, and  a faceface with one Mn(2)O6 octahedra. The Mn(5)-O(10) bond length is 1.91 Å. The Mn(5)-O(17) bond length is 1.92 Å. The Mn(5)-O(20) bond length is 2.06 Å. The Mn(5)-O(5) bond length is 1.93 Å. The Mn(5)-O(6) bond length is 1.96 Å. The Mn(5)-O(9) bond length is 1.98 Å. In the sixth Mn site, Mn(6) is bonded to one O(11), one O(12), one O(15), one O(16), one O(7), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one Mg(1)O4 trigonal pyramid and  a faceface with one Mn(4)O6 octahedra. The Mn(6)-O(11) bond length is 2.00 Å. The Mn(6)-O(12) bond length is 1.94 Å. The Mn(6)-O(15) bond length is 1.96 Å. The Mn(6)-O(16) bond length is 1.92 Å. The Mn(6)-O(7) bond length is 1.93 Å. The Mn(6)-O(8) bond length is 1.94 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), one Sr(8), one Mn(1), and one Mn(4) atom. In the second O site, O(2) is bonded to one Sr(3), one Sr(6), one Sr(7), one Mg(1), and one Mn(2) atom to form distorted OSr3MgMn trigonal bipyramids that share  a cornercorner with one O(6)Sr3Mn2 square pyramid and corners with two equivalent O(18)Sr3Mn tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(7), one Mg(1), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), one Sr(8), one Mn(1), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(5), one Sr(6), one Mn(2), and one Mn(5) atom. In the sixth O site, O(6) is bonded to one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom to form distorted corner-sharing OSr3Mn2 square pyramids. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Sr(8), one Mn(4), and one Mn(6) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Mn(3), and one Mn(6) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom. In the tenth O site, O(10) is bonded in a distorted T-shaped geometry to one Sr(3), one Mn(2), and one Mn(5) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Sr(8), one Mn(3), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Sr(8), one Mn(4), and one Mn(6) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(5), two equivalent Sr(4), and one Mn(1) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(3), one Sr(6), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), two equivalent Sr(7), one Mg(1), one Mn(3), and one Mn(6) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(5), two equivalent Sr(8), one Mn(4), and one Mn(6) atom. In the seventeenth O site, O(17) is bonded in a 5-coordinate geometry to one Sr(4), two equivalent Sr(5), one Mn(1), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded to one Sr(1), one Sr(3), one Sr(7), and one Mn(3) atom to form distorted corner-sharing OSr3Mn tetrahedra. In the nineteenth O site, O(19) is bonded in a 5-coordinate geometry to one Sr(4), one Sr(8), two equivalent Sr(2), and one Mn(4) atom. In the twentieth O site, O(20) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(6), one Mg(1), one Mn(2), and one Mn(5) atom.