Sr3Rh2O7 crystallizes in the orthorhombic Ccce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to two equivalent O(2) and five equivalent O(1) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. Rh(1) is bonded to one O(1), one O(3), and four equivalent O(2) atoms to form corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles range from 0-24°. There are three inequivalent O sites. In the first O site, O(1) is bonded to five equivalent Sr(1) and one Rh(1) atom to form OSr5Rh octahedra that share  a cornercorner with one O(3)Sr4Rh2 octahedra, corners with four equivalent O(1)Sr5Rh octahedra, and edges with eight equivalent O(1)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Rh(1) atoms. In the third O site, O(3) is bonded to four equivalent Sr(2) and two equivalent Rh(1) atoms to form OSr4Rh2 octahedra that share corners with two equivalent O(1)Sr5Rh octahedra, corners with four equivalent O(3)Sr4Rh2 octahedra, and edges with four equivalent O(3)Sr4Rh2 octahedra. The corner-sharing octahedra are not tilted.
Sr3Rh2O7 crystallizes in the orthorhombic Ccce space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to two equivalent O(2) and five equivalent O(1) atoms. Both Sr(1)-O(2) bond lengths are 2.42 Å. There is one shorter (2.50 Å) and four longer (2.75 Å) Sr(1)-O(1) bond lengths. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. All Sr(2)-O(2) bond lengths are 2.53 Å. All Sr(2)-O(3) bond lengths are 2.74 Å. Rh(1) is bonded to one O(1), one O(3), and four equivalent O(2) atoms to form corner-sharing RhO6 octahedra. The corner-sharing octahedral tilt angles range from 0-24°. The Rh(1)-O(1) bond length is 2.02 Å. The Rh(1)-O(3) bond length is 2.03 Å. All Rh(1)-O(2) bond lengths are 1.98 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to five equivalent Sr(1) and one Rh(1) atom to form OSr5Rh octahedra that share  a cornercorner with one O(3)Sr4Rh2 octahedra, corners with four equivalent O(1)Sr5Rh octahedra, and edges with eight equivalent O(1)Sr5Rh octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Rh(1) atoms. In the third O site, O(3) is bonded to four equivalent Sr(2) and two equivalent Rh(1) atoms to form OSr4Rh2 octahedra that share corners with two equivalent O(1)Sr5Rh octahedra, corners with four equivalent O(3)Sr4Rh2 octahedra, and edges with four equivalent O(3)Sr4Rh2 octahedra. The corner-sharing octahedra are not tilted.