Sr10Fe10O27 crystallizes in the orthorhombic Pmm2 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(15), one O(19), one O(20), two equivalent O(1), two equivalent O(10), two equivalent O(2), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a distorted q6 geometry to one O(16), one O(20), two equivalent O(11), two equivalent O(2), two equivalent O(3), and two equivalent O(7) atoms. In the third Sr site, Sr(3) is bonded in a distorted q6 geometry to one O(16), one O(17), one O(21), two equivalent O(12), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. In the fourth Sr site, Sr(4) is bonded to one O(17), one O(18), one O(21), one O(22), two equivalent O(13), two equivalent O(4), two equivalent O(5), and two equivalent O(9) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(4)O12 cuboctahedra, faces with four equivalent Sr(4)O12 cuboctahedra, faces with two equivalent Fe(10)O6 octahedra, faces with two equivalent Fe(4)O6 octahedra, faces with two equivalent Fe(9)O6 octahedra, and faces with two equivalent Fe(5)O5 trigonal bipyramids. In the fifth Sr site, Sr(5) is bonded in a distorted q6 geometry to one O(15), one O(18), one O(19), one O(22), two equivalent O(1), two equivalent O(14), and two equivalent O(5) atoms. There are ten inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(6), two equivalent O(1), and two equivalent O(15) atoms to form FeO5 trigonal bipyramids that share corners with two equivalent Fe(6)O6 octahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 10°. In the second Fe site, Fe(2) is bonded in a square co-planar geometry to one O(6), one O(7), and two equivalent O(2) atoms. In the third Fe site, Fe(3) is bonded to one O(7), one O(8), two equivalent O(16), and two equivalent O(3) atoms to form corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Fe site, Fe(4) is bonded to one O(8), one O(9), two equivalent O(17), and two equivalent O(4) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with two equivalent Fe(9)O6 octahedra,  a cornercorner with one Fe(5)O5 trigonal bipyramid, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the fifth Fe site, Fe(5) is bonded to one O(9), two equivalent O(18), and two equivalent O(5) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Fe(4)O6 octahedra, corners with two equivalent Fe(10)O6 octahedra, corners with two equivalent Fe(5)O5 trigonal bipyramids, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the sixth Fe site, Fe(6) is bonded to one O(10), one O(14), two equivalent O(1), and two equivalent O(19) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(10)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(6)O6 octahedra, and corners with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-3°. In the seventh Fe site, Fe(7) is bonded to one O(10), one O(11), two equivalent O(2), and two equivalent O(20) atoms to form corner-sharing FeO6 octahedra. The corner-sharing octahedra are not tilted. In the eighth Fe site, Fe(8) is bonded in a square co-planar geometry to one O(11), one O(12), and two equivalent O(3) atoms. In the ninth Fe site, Fe(9) is bonded to one O(12), one O(13), two equivalent O(21), and two equivalent O(4) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(10)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with two equivalent Fe(9)O6 octahedra, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. In the tenth Fe site, Fe(10) is bonded to one O(13), one O(14), two equivalent O(22), and two equivalent O(5) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(6)O6 octahedra,  a cornercorner with one Fe(9)O6 octahedra, corners with two equivalent Fe(10)O6 octahedra, corners with two equivalent Fe(5)O5 trigonal bipyramids, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedra are not tilted. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(5), one Fe(1), and one Fe(6) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-56°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Fe(2), and one Fe(7) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-65°. In the third O site, O(3) is bonded to two equivalent Sr(2), two equivalent Sr(3), one Fe(3), and one Fe(8) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°. In the fourth O site, O(4) is bonded to two equivalent Sr(3), two equivalent Sr(4), one Fe(4), and one Fe(9) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-59°. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to two equivalent Sr(4), two equivalent Sr(5), one Fe(10), and one Fe(5) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to four equivalent Sr(1), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded to four equivalent Sr(2), one Fe(2), and one Fe(3) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°. In the eighth O site, O(8) is bonded to four equivalent Sr(3), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the ninth O site, O(9) is bonded in a distorted linear geometry to four equivalent Sr(4), one Fe(4), and one Fe(5) atom. In the tenth O site, O(10) is bonded to four equivalent Sr(1), one Fe(6), and one Fe(7) atom to form a mixture of corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the eleventh O site, O(11) is bonded to four equivalent Sr(2), one Fe(7), and one Fe(8) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the twelfth O site, O(12) is bonded to four equivalent Sr(3), one Fe(8), and one Fe(9) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-68°. In the thirteenth O site, O(13) is bonded to four equivalent Sr(4), one Fe(10), and one Fe(9) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the fourteenth O site, O(14) is bonded to four equivalent Sr(5), one Fe(10), and one Fe(6) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(5), and two equivalent Fe(1) atoms. In the sixteenth O site, O(16) is bonded in a distorted linear geometry to two equivalent Sr(2), two equivalent Sr(3), and two equivalent Fe(3) atoms. In the seventeenth O site, O(17) is bonded to two equivalent Sr(3), two equivalent Sr(4), and two equivalent Fe(4) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to two equivalent Sr(4), two equivalent Sr(5), and two equivalent Fe(5) atoms. In the nineteenth O site, O(19) is bonded to two equivalent Sr(1), two equivalent Sr(5), and two equivalent Fe(6) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-55°. In the twentieth O site, O(20) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Fe(7) atoms. In the twenty-first O site, O(21) is bonded to two equivalent Sr(3), two equivalent Sr(4), and two equivalent Fe(9) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-63°. In the twenty-second O site, O(22) is bonded to two equivalent Sr(4), two equivalent Sr(5), and two equivalent Fe(10) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°.
Sr10Fe10O27 crystallizes in the orthorhombic Pmm2 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 11-coordinate geometry to one O(15), one O(19), one O(20), two equivalent O(1), two equivalent O(10), two equivalent O(2), and two equivalent O(6) atoms. The Sr(1)-O(15) bond length is 3.04 Å. The Sr(1)-O(19) bond length is 2.65 Å. The Sr(1)-O(20) bond length is 2.75 Å. Both Sr(1)-O(1) bond lengths are 2.81 Å. Both Sr(1)-O(10) bond lengths are 2.67 Å. Both Sr(1)-O(2) bond lengths are 2.80 Å. Both Sr(1)-O(6) bond lengths are 2.87 Å. In the second Sr site, Sr(2) is bonded in a distorted q6 geometry to one O(16), one O(20), two equivalent O(11), two equivalent O(2), two equivalent O(3), and two equivalent O(7) atoms. The Sr(2)-O(16) bond length is 2.73 Å. The Sr(2)-O(20) bond length is 2.78 Å. Both Sr(2)-O(11) bond lengths are 2.77 Å. Both Sr(2)-O(2) bond lengths are 2.78 Å. Both Sr(2)-O(3) bond lengths are 2.74 Å. Both Sr(2)-O(7) bond lengths are 2.77 Å. In the third Sr site, Sr(3) is bonded in a distorted q6 geometry to one O(16), one O(17), one O(21), two equivalent O(12), two equivalent O(3), two equivalent O(4), and two equivalent O(8) atoms. The Sr(3)-O(16) bond length is 2.84 Å. The Sr(3)-O(17) bond length is 2.69 Å. The Sr(3)-O(21) bond length is 2.77 Å. Both Sr(3)-O(12) bond lengths are 2.82 Å. Both Sr(3)-O(3) bond lengths are 2.83 Å. Both Sr(3)-O(4) bond lengths are 2.71 Å. Both Sr(3)-O(8) bond lengths are 2.72 Å. In the fourth Sr site, Sr(4) is bonded to one O(17), one O(18), one O(21), one O(22), two equivalent O(13), two equivalent O(4), two equivalent O(5), and two equivalent O(9) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(4)O12 cuboctahedra, faces with four equivalent Sr(4)O12 cuboctahedra, faces with two equivalent Fe(10)O6 octahedra, faces with two equivalent Fe(4)O6 octahedra, faces with two equivalent Fe(9)O6 octahedra, and faces with two equivalent Fe(5)O5 trigonal bipyramids. The Sr(4)-O(17) bond length is 2.81 Å. The Sr(4)-O(18) bond length is 3.11 Å. The Sr(4)-O(21) bond length is 2.74 Å. The Sr(4)-O(22) bond length is 2.78 Å. Both Sr(4)-O(13) bond lengths are 2.73 Å. Both Sr(4)-O(4) bond lengths are 2.73 Å. Both Sr(4)-O(5) bond lengths are 2.89 Å. Both Sr(4)-O(9) bond lengths are 2.81 Å. In the fifth Sr site, Sr(5) is bonded in a distorted q6 geometry to one O(15), one O(18), one O(19), one O(22), two equivalent O(1), two equivalent O(14), and two equivalent O(5) atoms. The Sr(5)-O(15) bond length is 2.72 Å. The Sr(5)-O(18) bond length is 2.65 Å. The Sr(5)-O(19) bond length is 2.73 Å. The Sr(5)-O(22) bond length is 2.70 Å. Both Sr(5)-O(1) bond lengths are 2.70 Å. Both Sr(5)-O(14) bond lengths are 2.68 Å. Both Sr(5)-O(5) bond lengths are 2.67 Å. There are ten inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(6), two equivalent O(1), and two equivalent O(15) atoms to form FeO5 trigonal bipyramids that share corners with two equivalent Fe(6)O6 octahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 10°. The Fe(1)-O(6) bond length is 1.91 Å. Both Fe(1)-O(1) bond lengths are 1.93 Å. Both Fe(1)-O(15) bond lengths are 1.98 Å. In the second Fe site, Fe(2) is bonded in a square co-planar geometry to one O(6), one O(7), and two equivalent O(2) atoms. The Fe(2)-O(6) bond length is 1.88 Å. The Fe(2)-O(7) bond length is 1.86 Å. Both Fe(2)-O(2) bond lengths are 1.87 Å. In the third Fe site, Fe(3) is bonded to one O(7), one O(8), two equivalent O(16), and two equivalent O(3) atoms to form corner-sharing FeO6 octahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Fe(3)-O(7) bond length is 2.07 Å. The Fe(3)-O(8) bond length is 1.99 Å. Both Fe(3)-O(16) bond lengths are 1.93 Å. Both Fe(3)-O(3) bond lengths are 2.08 Å. In the fourth Fe site, Fe(4) is bonded to one O(8), one O(9), two equivalent O(17), and two equivalent O(4) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(3)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with two equivalent Fe(9)O6 octahedra,  a cornercorner with one Fe(5)O5 trigonal bipyramid, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Fe(4)-O(8) bond length is 1.95 Å. The Fe(4)-O(9) bond length is 1.97 Å. Both Fe(4)-O(17) bond lengths are 1.93 Å. Both Fe(4)-O(4) bond lengths are 1.99 Å. In the fifth Fe site, Fe(5) is bonded to one O(9), two equivalent O(18), and two equivalent O(5) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Fe(4)O6 octahedra, corners with two equivalent Fe(10)O6 octahedra, corners with two equivalent Fe(5)O5 trigonal bipyramids, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-11°. The Fe(5)-O(9) bond length is 1.88 Å. Both Fe(5)-O(18) bond lengths are 1.98 Å. Both Fe(5)-O(5) bond lengths are 1.91 Å. In the sixth Fe site, Fe(6) is bonded to one O(10), one O(14), two equivalent O(1), and two equivalent O(19) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(10)O6 octahedra,  a cornercorner with one Fe(7)O6 octahedra, corners with two equivalent Fe(6)O6 octahedra, and corners with two equivalent Fe(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-3°. The Fe(6)-O(10) bond length is 1.97 Å. The Fe(6)-O(14) bond length is 1.95 Å. Both Fe(6)-O(1) bond lengths are 2.05 Å. Both Fe(6)-O(19) bond lengths are 1.93 Å. In the seventh Fe site, Fe(7) is bonded to one O(10), one O(11), two equivalent O(2), and two equivalent O(20) atoms to form corner-sharing FeO6 octahedra. The corner-sharing octahedra are not tilted. The Fe(7)-O(10) bond length is 2.03 Å. The Fe(7)-O(11) bond length is 2.04 Å. Both Fe(7)-O(2) bond lengths are 2.08 Å. Both Fe(7)-O(20) bond lengths are 1.93 Å. In the eighth Fe site, Fe(8) is bonded in a square co-planar geometry to one O(11), one O(12), and two equivalent O(3) atoms. The Fe(8)-O(11) bond length is 1.88 Å. The Fe(8)-O(12) bond length is 1.85 Å. Both Fe(8)-O(3) bond lengths are 1.88 Å. In the ninth Fe site, Fe(9) is bonded to one O(12), one O(13), two equivalent O(21), and two equivalent O(4) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(10)O6 octahedra, corners with two equivalent Fe(4)O6 octahedra, corners with two equivalent Fe(9)O6 octahedra, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Fe(9)-O(12) bond length is 2.05 Å. The Fe(9)-O(13) bond length is 2.05 Å. Both Fe(9)-O(21) bond lengths are 1.93 Å. Both Fe(9)-O(4) bond lengths are 1.96 Å. In the tenth Fe site, Fe(10) is bonded to one O(13), one O(14), two equivalent O(22), and two equivalent O(5) atoms to form FeO6 octahedra that share  a cornercorner with one Fe(6)O6 octahedra,  a cornercorner with one Fe(9)O6 octahedra, corners with two equivalent Fe(10)O6 octahedra, corners with two equivalent Fe(5)O5 trigonal bipyramids, and faces with four equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedra are not tilted. The Fe(10)-O(13) bond length is 1.92 Å. The Fe(10)-O(14) bond length is 1.96 Å. Both Fe(10)-O(22) bond lengths are 1.93 Å. Both Fe(10)-O(5) bond lengths are 2.06 Å. There are twenty-two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(1), two equivalent Sr(5), one Fe(1), and one Fe(6) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 4-56°. In the second O site, O(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Fe(2), and one Fe(7) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-65°. In the third O site, O(3) is bonded to two equivalent Sr(2), two equivalent Sr(3), one Fe(3), and one Fe(8) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°. In the fourth O site, O(4) is bonded to two equivalent Sr(3), two equivalent Sr(4), one Fe(4), and one Fe(9) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-59°. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to two equivalent Sr(4), two equivalent Sr(5), one Fe(10), and one Fe(5) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to four equivalent Sr(1), one Fe(1), and one Fe(2) atom. In the seventh O site, O(7) is bonded to four equivalent Sr(2), one Fe(2), and one Fe(3) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-65°. In the eighth O site, O(8) is bonded to four equivalent Sr(3), one Fe(3), and one Fe(4) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the ninth O site, O(9) is bonded in a distorted linear geometry to four equivalent Sr(4), one Fe(4), and one Fe(5) atom. In the tenth O site, O(10) is bonded to four equivalent Sr(1), one Fe(6), and one Fe(7) atom to form a mixture of corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the eleventh O site, O(11) is bonded to four equivalent Sr(2), one Fe(7), and one Fe(8) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the twelfth O site, O(12) is bonded to four equivalent Sr(3), one Fe(8), and one Fe(9) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-68°. In the thirteenth O site, O(13) is bonded to four equivalent Sr(4), one Fe(10), and one Fe(9) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the fourteenth O site, O(14) is bonded to four equivalent Sr(5), one Fe(10), and one Fe(6) atom to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(5), and two equivalent Fe(1) atoms. In the sixteenth O site, O(16) is bonded in a distorted linear geometry to two equivalent Sr(2), two equivalent Sr(3), and two equivalent Fe(3) atoms. In the seventeenth O site, O(17) is bonded to two equivalent Sr(3), two equivalent Sr(4), and two equivalent Fe(4) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the eighteenth O site, O(18) is bonded in a 4-coordinate geometry to two equivalent Sr(4), two equivalent Sr(5), and two equivalent Fe(5) atoms. In the nineteenth O site, O(19) is bonded to two equivalent Sr(1), two equivalent Sr(5), and two equivalent Fe(6) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 3-55°. In the twentieth O site, O(20) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Fe(7) atoms. In the twenty-first O site, O(21) is bonded to two equivalent Sr(3), two equivalent Sr(4), and two equivalent Fe(9) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 1-63°. In the twenty-second O site, O(22) is bonded to two equivalent Sr(4), two equivalent Sr(5), and two equivalent Fe(10) atoms to form a mixture of distorted corner, face, and edge-sharing OSr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°.