Sr2CrO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded in a 9-coordinate geometry to four equivalent O(2) and five equivalent O(1) atoms. Cr(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing CrO6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Cr(1) atoms to form distorted OSr4Cr2 octahedra that share corners with two equivalent O(2)Sr4Cr2 octahedra, corners with twelve equivalent O(1)Sr5Cr octahedra, edges with two equivalent O(2)Sr4Cr2 octahedra, faces with four equivalent O(2)Sr4Cr2 octahedra, and faces with four equivalent O(1)Sr5Cr octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second O site, O(1) is bonded to five equivalent Sr(1) and one Cr(1) atom to form OSr5Cr octahedra that share corners with five equivalent O(1)Sr5Cr octahedra, corners with twelve equivalent O(2)Sr4Cr2 octahedra, edges with eight equivalent O(1)Sr5Cr octahedra, and faces with four equivalent O(2)Sr4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°.
Sr2CrO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded in a 9-coordinate geometry to four equivalent O(2) and five equivalent O(1) atoms. All Sr(1)-O(2) bond lengths are 2.64 Å. There is one shorter (2.49 Å) and four longer (2.67 Å) Sr(1)-O(1) bond lengths. Cr(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing CrO6 octahedra. The corner-sharing octahedra are not tilted. Both Cr(1)-O(1) bond lengths are 1.97 Å. All Cr(1)-O(2) bond lengths are 1.89 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Cr(1) atoms to form distorted OSr4Cr2 octahedra that share corners with two equivalent O(2)Sr4Cr2 octahedra, corners with twelve equivalent O(1)Sr5Cr octahedra, edges with two equivalent O(2)Sr4Cr2 octahedra, faces with four equivalent O(2)Sr4Cr2 octahedra, and faces with four equivalent O(1)Sr5Cr octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second O site, O(1) is bonded to five equivalent Sr(1) and one Cr(1) atom to form OSr5Cr octahedra that share corners with five equivalent O(1)Sr5Cr octahedra, corners with twelve equivalent O(2)Sr4Cr2 octahedra, edges with eight equivalent O(1)Sr5Cr octahedra, and faces with four equivalent O(2)Sr4Cr2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°.