Sr4Fe3O10 crystallizes in the triclinic P-1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one O(9), two equivalent O(2), and two equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(9), two equivalent O(5), and two equivalent O(7) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(8), two equivalent O(10), and two equivalent O(7) atoms. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one O(9), two equivalent O(10), and two equivalent O(2) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra and  a cornercorner with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 3-11°. In the second Fe site, Fe(2) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra and  a cornercorner with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 3-11°. In the third Fe site, Fe(3) is bonded to one O(1), one O(8), one O(9), and two equivalent O(6) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 27°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(4), and one Fe(3) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(4), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Fe(1) atom to form distorted OSr4Fe square pyramids that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(4)Sr4Fe square pyramids,  a faceface with one O(10)Sr4Fe2 octahedra, and  a faceface with one O(5)Sr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 55-64°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Fe(2) atom to form distorted OSr4Fe square pyramids that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(3)Sr4Fe square pyramids,  a faceface with one O(10)Sr4Fe2 octahedra, and  a faceface with one O(5)Sr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Fe(1), and one Fe(2) atom to form distorted OSr4Fe2 octahedra that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Fe square pyramids, corners with two equivalent O(4)Sr4Fe square pyramids, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(5)Sr4Fe2 octahedra,  a faceface with one O(3)Sr4Fe square pyramid, and  a faceface with one O(4)Sr4Fe square pyramid. The corner-sharing octahedral tilt angles range from 1-5°. In the sixth O site, O(6) is bonded to one Sr(2), one Sr(3), and two equivalent Fe(3) atoms to form OSr2Fe2 tetrahedra that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Fe square pyramids, corners with two equivalent O(4)Sr4Fe square pyramids, and  an edgeedge with one O(6)Sr2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 52-53°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), one Fe(1), and one Fe(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Fe(1), and one Fe(3) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Fe(2), and one Fe(3) atom. In the tenth O site, O(10) is bonded to two equivalent Sr(3), two equivalent Sr(4), one Fe(1), and one Fe(2) atom to form distorted OSr4Fe2 octahedra that share corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Fe square pyramids, corners with two equivalent O(4)Sr4Fe square pyramids, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(10)Sr4Fe2 octahedra,  a faceface with one O(3)Sr4Fe square pyramid, and  a faceface with one O(4)Sr4Fe square pyramid. The corner-sharing octahedral tilt angles range from 1-5°.
Sr4Fe3O10 crystallizes in the triclinic P-1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one O(9), two equivalent O(2), and two equivalent O(5) atoms. The Sr(1)-O(1) bond length is 2.48 Å. The Sr(1)-O(3) bond length is 2.73 Å. The Sr(1)-O(4) bond length is 2.87 Å. The Sr(1)-O(8) bond length is 2.85 Å. The Sr(1)-O(9) bond length is 2.61 Å. There is one shorter (2.68 Å) and one longer (2.76 Å) Sr(1)-O(2) bond length. There is one shorter (2.58 Å) and one longer (2.79 Å) Sr(1)-O(5) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(9), two equivalent O(5), and two equivalent O(7) atoms. The Sr(2)-O(3) bond length is 2.58 Å. The Sr(2)-O(4) bond length is 2.73 Å. The Sr(2)-O(6) bond length is 2.41 Å. The Sr(2)-O(9) bond length is 2.70 Å. There is one shorter (2.59 Å) and one longer (2.65 Å) Sr(2)-O(5) bond length. There is one shorter (2.64 Å) and one longer (2.74 Å) Sr(2)-O(7) bond length. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(3), one O(4), one O(6), one O(8), two equivalent O(10), and two equivalent O(7) atoms. The Sr(3)-O(3) bond length is 2.70 Å. The Sr(3)-O(4) bond length is 2.58 Å. The Sr(3)-O(6) bond length is 2.40 Å. The Sr(3)-O(8) bond length is 2.75 Å. There is one shorter (2.59 Å) and one longer (2.70 Å) Sr(3)-O(10) bond length. There is one shorter (2.63 Å) and one longer (2.74 Å) Sr(3)-O(7) bond length. In the fourth Sr site, Sr(4) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one O(9), two equivalent O(10), and two equivalent O(2) atoms. The Sr(4)-O(1) bond length is 2.47 Å. The Sr(4)-O(3) bond length is 2.83 Å. The Sr(4)-O(4) bond length is 2.72 Å. The Sr(4)-O(8) bond length is 2.62 Å. The Sr(4)-O(9) bond length is 2.89 Å. There is one shorter (2.55 Å) and one longer (2.82 Å) Sr(4)-O(10) bond length. There is one shorter (2.71 Å) and one longer (2.79 Å) Sr(4)-O(2) bond length. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(2), one O(3), one O(5), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with four equivalent Fe(2)O6 octahedra and  a cornercorner with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 3-11°. The Fe(1)-O(10) bond length is 2.11 Å. The Fe(1)-O(2) bond length is 1.86 Å. The Fe(1)-O(3) bond length is 1.87 Å. The Fe(1)-O(5) bond length is 2.08 Å. The Fe(1)-O(7) bond length is 1.88 Å. The Fe(1)-O(8) bond length is 2.11 Å. In the second Fe site, Fe(2) is bonded to one O(10), one O(2), one O(4), one O(5), one O(7), and one O(9) atom to form FeO6 octahedra that share corners with four equivalent Fe(1)O6 octahedra and  a cornercorner with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 3-11°. The Fe(2)-O(10) bond length is 1.90 Å. The Fe(2)-O(2) bond length is 1.98 Å. The Fe(2)-O(4) bond length is 1.87 Å. The Fe(2)-O(5) bond length is 1.92 Å. The Fe(2)-O(7) bond length is 2.02 Å. The Fe(2)-O(9) bond length is 2.23 Å. In the third Fe site, Fe(3) is bonded to one O(1), one O(8), one O(9), and two equivalent O(6) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 27°. The Fe(3)-O(1) bond length is 1.79 Å. The Fe(3)-O(8) bond length is 1.96 Å. The Fe(3)-O(9) bond length is 1.92 Å. There is one shorter (1.93 Å) and one longer (2.02 Å) Fe(3)-O(6) bond length. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(4), and one Fe(3) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(4), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Fe(1) atom to form distorted OSr4Fe square pyramids that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(4)Sr4Fe square pyramids,  a faceface with one O(10)Sr4Fe2 octahedra, and  a faceface with one O(5)Sr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 55-64°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sr(4), and one Fe(2) atom to form distorted OSr4Fe square pyramids that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(3)Sr4Fe square pyramids,  a faceface with one O(10)Sr4Fe2 octahedra, and  a faceface with one O(5)Sr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. In the fifth O site, O(5) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Fe(1), and one Fe(2) atom to form distorted OSr4Fe2 octahedra that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Fe square pyramids, corners with two equivalent O(4)Sr4Fe square pyramids, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(5)Sr4Fe2 octahedra,  a faceface with one O(3)Sr4Fe square pyramid, and  a faceface with one O(4)Sr4Fe square pyramid. The corner-sharing octahedral tilt angles range from 1-5°. In the sixth O site, O(6) is bonded to one Sr(2), one Sr(3), and two equivalent Fe(3) atoms to form OSr2Fe2 tetrahedra that share corners with two equivalent O(10)Sr4Fe2 octahedra, corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Fe square pyramids, corners with two equivalent O(4)Sr4Fe square pyramids, and  an edgeedge with one O(6)Sr2Fe2 tetrahedra. The corner-sharing octahedral tilt angles range from 52-53°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(3), one Fe(1), and one Fe(2) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Fe(1), and one Fe(3) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Fe(2), and one Fe(3) atom. In the tenth O site, O(10) is bonded to two equivalent Sr(3), two equivalent Sr(4), one Fe(1), and one Fe(2) atom to form distorted OSr4Fe2 octahedra that share corners with two equivalent O(5)Sr4Fe2 octahedra, corners with two equivalent O(3)Sr4Fe square pyramids, corners with two equivalent O(4)Sr4Fe square pyramids, corners with two equivalent O(6)Sr2Fe2 tetrahedra, edges with two equivalent O(10)Sr4Fe2 octahedra,  a faceface with one O(3)Sr4Fe square pyramid, and  a faceface with one O(4)Sr4Fe square pyramid. The corner-sharing octahedral tilt angles range from 1-5°.