Sr2TaGaO6 crystallizes in the tetragonal I4/m 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 twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Ga(1)O6 octahedra. Ta(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Ga(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. Ga(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form GaO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent Sr(1), one Ta(1), and one Ga(1) atom. In the second O site, O(2) is bonded to four equivalent Sr(1), one Ta(1), and one Ga(1) atom to form a mixture of distorted corner and edge-sharing OSr4TaGa octahedra. The corner-sharing octahedra are not tilted.
Sr2TaGaO6 crystallizes in the tetragonal I4/m 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 twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Ga(1)O6 octahedra. All Sr(1)-O(2) bond lengths are 2.79 Å. There are four shorter (2.65 Å) and four longer (2.96 Å) Sr(1)-O(1) bond lengths. Ta(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form TaO6 octahedra that share corners with six equivalent Ga(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. Both Ta(1)-O(2) bond lengths are 1.98 Å. All Ta(1)-O(1) bond lengths are 1.98 Å. Ga(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form GaO6 octahedra that share corners with six equivalent Ta(1)O6 octahedra and faces with eight equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-13°. Both Ga(1)-O(2) bond lengths are 1.99 Å. All Ga(1)-O(1) bond lengths are 1.98 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to four equivalent Sr(1), one Ta(1), and one Ga(1) atom. In the second O site, O(2) is bonded to four equivalent Sr(1), one Ta(1), and one Ga(1) atom to form a mixture of distorted corner and edge-sharing OSr4TaGa octahedra. The corner-sharing octahedra are not tilted.