SrGd2Sc2O7 crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent O(1) and eight equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with eight equivalent Sc(1)O6 octahedra. Gd(1) is bonded in a 9-coordinate geometry to four equivalent O(3) and five equivalent O(2) atoms. Sc(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form ScO6 octahedra that share corners with five equivalent Sc(1)O6 octahedra and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Sc(1) atoms to form a mixture of distorted edge and corner-sharing OSr4Sc2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a distorted linear geometry to five equivalent Gd(1) and one Sc(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Gd(1), and two equivalent Sc(1) atoms.
SrGd2Sc2O7 crystallizes in the tetragonal I4/mmm space group. Sr(1) is bonded to four equivalent O(1) and eight equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and faces with eight equivalent Sc(1)O6 octahedra. All Sr(1)-O(1) bond lengths are 2.86 Å. All Sr(1)-O(3) bond lengths are 3.06 Å. Gd(1) is bonded in a 9-coordinate geometry to four equivalent O(3) and five equivalent O(2) atoms. All Gd(1)-O(3) bond lengths are 2.48 Å. There is one shorter (2.15 Å) and four longer (2.92 Å) Gd(1)-O(2) bond lengths. Sc(1) is bonded to one O(1), one O(2), and four equivalent O(3) atoms to form ScO6 octahedra that share corners with five equivalent Sc(1)O6 octahedra and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. The Sc(1)-O(1) bond length is 2.07 Å. The Sc(1)-O(2) bond length is 2.22 Å. All Sc(1)-O(3) bond lengths are 2.04 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(1) and two equivalent Sc(1) atoms to form a mixture of distorted edge and corner-sharing OSr4Sc2 octahedra. The corner-sharing octahedra are not tilted. In the second O site, O(2) is bonded in a distorted linear geometry to five equivalent Gd(1) and one Sc(1) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Gd(1), and two equivalent Sc(1) atoms.