SrSmCr4O12 crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Sm(1)O12 cuboctahedra, and faces with eight equivalent Cr(1)O6 octahedra. Sm(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form SmO12 cuboctahedra that share corners with four equivalent Sm(1)O12 cuboctahedra, corners with eight equivalent Sr(1)O12 cuboctahedra, and faces with eight equivalent Cr(1)O6 octahedra. Cr(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form CrO6 octahedra that share corners with six equivalent Cr(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Sm(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-6°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Sm(1), and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to two equivalent Sr(1) and two equivalent Cr(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Sm(1) and two equivalent Cr(1) atoms.
SrSmCr4O12 crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Sm(1)O12 cuboctahedra, and faces with eight equivalent Cr(1)O6 octahedra. All Sr(1)-O(2) bond lengths are 2.66 Å. All Sr(1)-O(1) bond lengths are 2.75 Å. Sm(1) is bonded to four equivalent O(3) and eight equivalent O(1) atoms to form SmO12 cuboctahedra that share corners with four equivalent Sm(1)O12 cuboctahedra, corners with eight equivalent Sr(1)O12 cuboctahedra, and faces with eight equivalent Cr(1)O6 octahedra. All Sm(1)-O(3) bond lengths are 2.66 Å. All Sm(1)-O(1) bond lengths are 2.60 Å. Cr(1) is bonded to one O(2), one O(3), and four equivalent O(1) atoms to form CrO6 octahedra that share corners with six equivalent Cr(1)O6 octahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Sm(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-6°. The Cr(1)-O(2) bond length is 1.88 Å. The Cr(1)-O(3) bond length is 1.92 Å. All Cr(1)-O(1) bond lengths are 1.89 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Sm(1), and two equivalent Cr(1) atoms. In the second O site, O(2) is bonded in a distorted square co-planar geometry to two equivalent Sr(1) and two equivalent Cr(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Sm(1) and two equivalent Cr(1) atoms.