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 7-coordinate geometry to one O(14), one O(15), one O(2), one O(3), one O(8), and two equivalent O(18) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(16), one O(18), one O(19), one O(7), and one O(8) atom. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(13), one O(2), one O(20), one O(5), one O(6), one O(9), and two equivalent O(14) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(17), one O(4), one O(5), one O(6), one O(9), and two equivalent O(13) atoms. In the fifth Sr site, Sr(5) is bonded in a 8-coordinate geometry to one O(10), one O(13), 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 10-coordinate geometry to one O(10), one O(14), one O(15), one O(2), one O(3), one O(5), one O(6), one O(9), and two equivalent O(20) atoms. In the seventh Sr site, Sr(7) is bonded in a 9-coordinate geometry to one O(11), one O(18), one O(2), one O(20), 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 6-coordinate geometry to one O(1), one O(12), one O(16), one O(17), one O(19), and one O(4) atom. Mg(1) is bonded in a 5-coordinate geometry to one O(11), one O(16), one O(19), one O(7), and one O(8) atom. 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 distorted face-sharing MnO6 octahedra. 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 a mixture of corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-22°. In the third Mn site, Mn(3) is bonded to one O(11), one O(15), one O(18), one O(2), one O(3), and one O(8) atom to form a mixture of distorted corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-22°. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(16), one O(19), one O(4), and one O(7) atom. 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 face-sharing MnO6 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 face-sharing MnO6 octahedra. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), one Sr(8), one Mn(1), and one Mn(4) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Sr(6), one Sr(7), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(6), one Sr(7), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded to one Sr(4), one Sr(5), one Sr(8), one Mn(1), and one Mn(4) atom to form a mixture of distorted corner and face-sharing OSr3Mn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 28-51°. In the fifth O site, O(5) is bonded to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(2), and one Mn(5) atom to form distorted OSr4Mn2 octahedra that share  a cornercorner with one O(15)Sr4Mn2 octahedra,  a cornercorner with one O(9)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr3Mn2 trigonal bipyramids, and edges with two equivalent O(9)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-54°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(7), one Mg(1), one Mn(4), and one Mn(6) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Mg(1), one Mn(3), and one Mn(6) atom. In the ninth O site, O(9) is bonded to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom to form distorted OSr4Mn2 octahedra that share  a cornercorner with one O(15)Sr4Mn2 octahedra,  a cornercorner with one O(5)Sr4Mn2 octahedra, edges with two equivalent O(5)Sr4Mn2 octahedra, and  a faceface with one O(4)Sr3Mn2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 1-40°. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(2), and one Mn(5) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Sr(2), one Sr(7), one Mg(1), one Mn(3), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Sr(8), one Mn(4), and one Mn(6) atom. In the thirteenth O site, O(13) is bonded in a 1-coordinate geometry to one Sr(3), one Sr(5), two equivalent Sr(4), and one Mn(1) atom. In the fourteenth O site, O(14) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(6), two equivalent Sr(3), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(6), two equivalent Sr(7), one Mn(3), and one Mn(6) atom to form distorted corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 3-54°. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(8), one Mg(1), one Mn(4), and one Mn(6) atom. In the seventeenth O site, O(17) is bonded in a 6-coordinate geometry to one Sr(4), one Sr(8), two equivalent Sr(5), one Mn(1), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(7), two equivalent Sr(1), and one Mn(3) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(8), one Mg(1), and one Mn(4) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(7), two equivalent Sr(6), 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 7-coordinate geometry to one O(14), one O(15), one O(2), one O(3), one O(8), and two equivalent O(18) atoms. The Sr(1)-O(14) bond length is 2.57 Å. The Sr(1)-O(15) bond length is 2.49 Å. The Sr(1)-O(2) bond length is 2.67 Å. The Sr(1)-O(3) bond length is 2.56 Å. The Sr(1)-O(8) bond length is 2.59 Å. There is one shorter (2.64 Å) and one longer (3.00 Å) Sr(1)-O(18) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(16), one O(18), one O(19), one O(7), and one O(8) atom. The Sr(2)-O(1) bond length is 3.00 Å. The Sr(2)-O(11) bond length is 2.69 Å. The Sr(2)-O(12) bond length is 2.56 Å. The Sr(2)-O(16) bond length is 2.62 Å. The Sr(2)-O(18) bond length is 2.70 Å. The Sr(2)-O(19) bond length is 2.56 Å. The Sr(2)-O(7) bond length is 2.57 Å. The Sr(2)-O(8) bond length is 2.63 Å. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(13), one O(2), one O(20), one O(5), one O(6), one O(9), and two equivalent O(14) atoms. The Sr(3)-O(10) bond length is 2.45 Å. The Sr(3)-O(13) bond length is 3.02 Å. The Sr(3)-O(2) bond length is 2.76 Å. The Sr(3)-O(20) bond length is 2.63 Å. The Sr(3)-O(5) bond length is 2.75 Å. The Sr(3)-O(6) bond length is 2.82 Å. The Sr(3)-O(9) bond length is 2.63 Å. There is one shorter (2.85 Å) and one longer (2.99 Å) Sr(3)-O(14) bond length. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(17), one O(4), one O(5), one O(6), one O(9), and two equivalent O(13) atoms. The Sr(4)-O(1) bond length is 3.19 Å. The Sr(4)-O(10) bond length is 3.01 Å. The Sr(4)-O(17) bond length is 2.61 Å. The Sr(4)-O(4) bond length is 2.66 Å. The Sr(4)-O(5) bond length is 2.72 Å. The Sr(4)-O(6) bond length is 2.48 Å. The Sr(4)-O(9) bond length is 2.77 Å. There is one shorter (2.74 Å) and one longer (2.92 Å) Sr(4)-O(13) bond length. In the fifth Sr site, Sr(5) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(4), one O(5), one O(6), one O(9), and two equivalent O(17) atoms. The Sr(5)-O(10) bond length is 2.94 Å. The Sr(5)-O(13) bond length is 2.40 Å. The Sr(5)-O(4) bond length is 2.54 Å. The Sr(5)-O(5) bond length is 2.61 Å. The Sr(5)-O(6) bond length is 2.60 Å. The Sr(5)-O(9) bond length is 2.65 Å. There is one shorter (2.76 Å) and one longer (2.88 Å) Sr(5)-O(17) bond length. In the sixth Sr site, Sr(6) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(15), one O(2), one O(3), one O(5), one O(6), one O(9), and two equivalent O(20) atoms. The Sr(6)-O(10) bond length is 2.61 Å. The Sr(6)-O(14) bond length is 2.46 Å. The Sr(6)-O(15) bond length is 2.96 Å. The Sr(6)-O(2) bond length is 2.55 Å. The Sr(6)-O(3) bond length is 3.04 Å. The Sr(6)-O(5) bond length is 2.72 Å. The Sr(6)-O(6) bond length is 3.16 Å. The Sr(6)-O(9) bond length is 2.78 Å. There is one shorter (2.67 Å) and one longer (2.95 Å) Sr(6)-O(20) bond length. In the seventh Sr site, Sr(7) is bonded in a 9-coordinate geometry to one O(11), one O(18), one O(2), one O(20), one O(3), one O(7), one O(8), and two equivalent O(15) atoms. The Sr(7)-O(11) bond length is 2.65 Å. The Sr(7)-O(18) bond length is 2.42 Å. The Sr(7)-O(2) bond length is 3.14 Å. The Sr(7)-O(20) bond length is 2.91 Å. The Sr(7)-O(3) bond length is 2.47 Å. The Sr(7)-O(7) bond length is 2.57 Å. The Sr(7)-O(8) bond length is 2.80 Å. There is one shorter (2.75 Å) and one longer (2.86 Å) Sr(7)-O(15) bond length. In the eighth Sr site, Sr(8) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(16), one O(17), one O(19), and one O(4) atom. The Sr(8)-O(1) bond length is 2.50 Å. The Sr(8)-O(12) bond length is 2.61 Å. The Sr(8)-O(16) bond length is 2.49 Å. The Sr(8)-O(17) bond length is 2.46 Å. The Sr(8)-O(19) bond length is 2.55 Å. The Sr(8)-O(4) bond length is 2.48 Å. Mg(1) is bonded in a 5-coordinate geometry to one O(11), one O(16), one O(19), one O(7), and one O(8) atom. The Mg(1)-O(11) bond length is 2.04 Å. The Mg(1)-O(16) bond length is 2.14 Å. The Mg(1)-O(19) bond length is 1.98 Å. The Mg(1)-O(7) bond length is 2.24 Å. The Mg(1)-O(8) bond length is 1.92 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 distorted face-sharing MnO6 octahedra. The Mn(1)-O(1) bond length is 1.95 Å. The Mn(1)-O(13) bond length is 1.80 Å. The Mn(1)-O(17) bond length is 2.16 Å. The Mn(1)-O(4) bond length is 1.93 Å. The Mn(1)-O(6) bond length is 2.00 Å. The Mn(1)-O(9) bond length is 2.04 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 a mixture of corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-22°. The Mn(2)-O(10) bond length is 2.05 Å. The Mn(2)-O(14) bond length is 1.87 Å. The Mn(2)-O(2) bond length is 1.89 Å. The Mn(2)-O(20) bond length is 2.08 Å. The Mn(2)-O(3) bond length is 1.90 Å. The Mn(2)-O(5) bond length is 1.99 Å. In the third Mn site, Mn(3) is bonded to one O(11), one O(15), one O(18), one O(2), one O(3), and one O(8) atom to form a mixture of distorted corner and face-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 15-22°. The Mn(3)-O(11) bond length is 2.38 Å. The Mn(3)-O(15) bond length is 2.11 Å. The Mn(3)-O(18) bond length is 1.88 Å. The Mn(3)-O(2) bond length is 2.05 Å. The Mn(3)-O(3) bond length is 1.90 Å. The Mn(3)-O(8) bond length is 1.97 Å. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(16), one O(19), one O(4), and one O(7) atom. The Mn(4)-O(1) bond length is 1.94 Å. The Mn(4)-O(12) bond length is 1.95 Å. The Mn(4)-O(16) bond length is 2.71 Å. The Mn(4)-O(19) bond length is 1.93 Å. The Mn(4)-O(4) bond length is 2.03 Å. The Mn(4)-O(7) bond length is 2.35 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 face-sharing MnO6 octahedra. The Mn(5)-O(10) bond length is 1.91 Å. The Mn(5)-O(17) bond length is 1.94 Å. The Mn(5)-O(20) bond length is 1.93 Å. The Mn(5)-O(5) bond length is 1.94 Å. The Mn(5)-O(6) bond length is 1.94 Å. The Mn(5)-O(9) bond length is 1.91 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 face-sharing MnO6 octahedra. The Mn(6)-O(11) bond length is 1.95 Å. The Mn(6)-O(12) bond length is 1.90 Å. The Mn(6)-O(15) bond length is 2.04 Å. The Mn(6)-O(16) bond length is 1.94 Å. The Mn(6)-O(7) bond length is 1.93 Å. The Mn(6)-O(8) bond length is 2.07 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(4), one Sr(8), one Mn(1), and one Mn(4) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), one Sr(6), one Sr(7), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(6), one Sr(7), one Mn(2), and one Mn(3) atom. In the fourth O site, O(4) is bonded to one Sr(4), one Sr(5), one Sr(8), one Mn(1), and one Mn(4) atom to form a mixture of distorted corner and face-sharing OSr3Mn2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 28-51°. In the fifth O site, O(5) is bonded to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(2), and one Mn(5) atom to form distorted OSr4Mn2 octahedra that share  a cornercorner with one O(15)Sr4Mn2 octahedra,  a cornercorner with one O(9)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr3Mn2 trigonal bipyramids, and edges with two equivalent O(9)Sr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-54°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(7), one Mg(1), one Mn(4), and one Mn(6) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), one Mg(1), one Mn(3), and one Mn(6) atom. In the ninth O site, O(9) is bonded to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(1), and one Mn(5) atom to form distorted OSr4Mn2 octahedra that share  a cornercorner with one O(15)Sr4Mn2 octahedra,  a cornercorner with one O(5)Sr4Mn2 octahedra, edges with two equivalent O(5)Sr4Mn2 octahedra, and  a faceface with one O(4)Sr3Mn2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 1-40°. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(6), one Mn(2), and one Mn(5) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Sr(2), one Sr(7), one Mg(1), one Mn(3), and one Mn(6) atom. In the twelfth O site, O(12) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Sr(8), one Mn(4), and one Mn(6) atom. In the thirteenth O site, O(13) is bonded in a 1-coordinate geometry to one Sr(3), one Sr(5), two equivalent Sr(4), and one Mn(1) atom. In the fourteenth O site, O(14) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(6), two equivalent Sr(3), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded to one Sr(1), one Sr(6), two equivalent Sr(7), one Mn(3), and one Mn(6) atom to form distorted corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 3-54°. In the sixteenth O site, O(16) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(8), one Mg(1), one Mn(4), and one Mn(6) atom. In the seventeenth O site, O(17) is bonded in a 6-coordinate geometry to one Sr(4), one Sr(8), two equivalent Sr(5), one Mn(1), and one Mn(5) atom. In the eighteenth O site, O(18) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(7), two equivalent Sr(1), and one Mn(3) atom. In the nineteenth O site, O(19) is bonded in a 4-coordinate geometry to one Sr(2), one Sr(8), one Mg(1), and one Mn(4) atom. In the twentieth O site, O(20) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(7), two equivalent Sr(6), one Mn(2), and one Mn(5) atom.