SrMn2BiO6 crystallizes in the tetragonal I4mm 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 and faces with eight equivalent Mn(1)O6 octahedra. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-10°. Bi(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Mn(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Mn(1) atoms.
SrMn2BiO6 crystallizes in the tetragonal I4mm 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 and faces with eight equivalent Mn(1)O6 octahedra. All Sr(1)-O(2) bond lengths are 2.78 Å. There are four shorter (2.72 Å) and four longer (2.89 Å) Sr(1)-O(1) bond lengths. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-10°. There is one shorter (1.94 Å) and one longer (2.04 Å) Mn(1)-O(2) bond length. All Mn(1)-O(1) bond lengths are 1.97 Å. Bi(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. All Bi(1)-O(1) bond lengths are 2.35 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Mn(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Mn(1) atoms.