Sr2FeO3 crystallizes in the orthorhombic Immm space group. Sr(1) is bonded to two equivalent O(1) and five equivalent O(2) atoms to form a mixture of distorted face, corner, and edge-sharing SrO7 pentagonal bipyramids. Fe(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Fe(1) atoms to form OSr4Fe2 octahedra that share corners with two equivalent O(1)Sr4Fe2 octahedra, corners with twelve equivalent O(2)Sr5Fe octahedra, edges with two equivalent O(1)Sr4Fe2 octahedra, and faces with four equivalent O(2)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second O site, O(2) is bonded to five equivalent Sr(1) and one Fe(1) atom to form OSr5Fe octahedra that share corners with five equivalent O(2)Sr5Fe octahedra, corners with six equivalent O(1)Sr4Fe2 octahedra, edges with eight equivalent O(2)Sr5Fe octahedra, and faces with two equivalent O(1)Sr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-61°.
Sr2FeO3 crystallizes in the orthorhombic Immm space group. Sr(1) is bonded to two equivalent O(1) and five equivalent O(2) atoms to form a mixture of distorted face, corner, and edge-sharing SrO7 pentagonal bipyramids. Both Sr(1)-O(1) bond lengths are 2.61 Å. There is one shorter (2.51 Å) and four longer (2.65 Å) Sr(1)-O(2) bond lengths. Fe(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Fe(1)-O(1) bond lengths are 1.96 Å. Both Fe(1)-O(2) bond lengths are 2.01 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Fe(1) atoms to form OSr4Fe2 octahedra that share corners with two equivalent O(1)Sr4Fe2 octahedra, corners with twelve equivalent O(2)Sr5Fe octahedra, edges with two equivalent O(1)Sr4Fe2 octahedra, and faces with four equivalent O(2)Sr5Fe octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the second O site, O(2) is bonded to five equivalent Sr(1) and one Fe(1) atom to form OSr5Fe octahedra that share corners with five equivalent O(2)Sr5Fe octahedra, corners with six equivalent O(1)Sr4Fe2 octahedra, edges with eight equivalent O(2)Sr5Fe octahedra, and faces with two equivalent O(1)Sr4Fe2 octahedra. The corner-sharing octahedral tilt angles range from 0-61°.