Sr2RhO4 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. Rh(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing RhO6 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 Rh(1) atoms to form OSr4Rh2 octahedra that share corners with two equivalent O(2)Sr4Rh2 octahedra, corners with twelve equivalent O(1)Sr5Rh octahedra, edges with two equivalent O(2)Sr4Rh2 octahedra, faces with four equivalent O(2)Sr4Rh2 octahedra, and faces with four equivalent O(1)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the second O site, O(1) is bonded to five equivalent Sr(1) and one Rh(1) atom to form OSr5Rh octahedra that share corners with five equivalent O(1)Sr5Rh octahedra, corners with twelve equivalent O(2)Sr4Rh2 octahedra, edges with eight equivalent O(1)Sr5Rh octahedra, and faces with four equivalent O(2)Sr4Rh2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°.
Sr2RhO4 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 2.68 Å. There is one shorter (2.44 Å) and four longer (2.75 Å) Sr(1)-O(1) bond lengths. Rh(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing RhO6 octahedra. The corner-sharing octahedra are not tilted. Both Rh(1)-O(1) bond lengths are 2.05 Å. All Rh(1)-O(2) bond lengths are 1.94 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Rh(1) atoms to form OSr4Rh2 octahedra that share corners with two equivalent O(2)Sr4Rh2 octahedra, corners with twelve equivalent O(1)Sr5Rh octahedra, edges with two equivalent O(2)Sr4Rh2 octahedra, faces with four equivalent O(2)Sr4Rh2 octahedra, and faces with four equivalent O(1)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the second O site, O(1) is bonded to five equivalent Sr(1) and one Rh(1) atom to form OSr5Rh octahedra that share corners with five equivalent O(1)Sr5Rh octahedra, corners with twelve equivalent O(2)Sr4Rh2 octahedra, edges with eight equivalent O(1)Sr5Rh octahedra, and faces with four equivalent O(2)Sr4Rh2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°.