Sr3Ti2Mn2BiO12 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent O(2), three equivalent O(3), and six equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Bi(1)O12 cuboctahedra, faces with four equivalent Ti(1)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to six equivalent O(1) and six equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, corners with six equivalent Bi(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Mn(1)O6 octahedra, and faces with six equivalent Ti(1)O6 octahedra. Ti(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form TiO6 octahedra that share corners with three equivalent Ti(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a faceface with one Bi(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Ti(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with three equivalent Bi(1)O12 cuboctahedra, and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. Bi(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BiO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, corners with six equivalent Bi(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, and faces with six equivalent Mn(1)O6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(2), two equivalent Sr(1), one Ti(1), one 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), two equivalent Mn(1), and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ti(1) atoms.
Sr3Ti2Mn2BiO12 is (Cubic) Perovskite-derived structured and crystallizes in the trigonal R-3m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to three equivalent O(2), three equivalent O(3), and six equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Bi(1)O12 cuboctahedra, faces with four equivalent Ti(1)O6 octahedra, and faces with four equivalent Mn(1)O6 octahedra. All Sr(1)-O(2) bond lengths are 2.74 Å. All Sr(1)-O(3) bond lengths are 2.79 Å. All Sr(1)-O(1) bond lengths are 2.78 Å. In the second Sr site, Sr(2) is bonded to six equivalent O(1) and six equivalent O(3) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, corners with six equivalent Bi(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Mn(1)O6 octahedra, and faces with six equivalent Ti(1)O6 octahedra. All Sr(2)-O(1) bond lengths are 2.81 Å. All Sr(2)-O(3) bond lengths are 2.78 Å. Ti(1) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form TiO6 octahedra that share corners with three equivalent Ti(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a faceface with one Bi(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. All Ti(1)-O(1) bond lengths are 1.96 Å. All Ti(1)-O(3) bond lengths are 1.97 Å. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Ti(1)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with three equivalent Bi(1)O12 cuboctahedra, and faces with four equivalent Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. All Mn(1)-O(1) bond lengths are 1.96 Å. All Mn(1)-O(2) bond lengths are 1.96 Å. Bi(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form BiO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, corners with six equivalent Bi(1)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, and faces with six equivalent Mn(1)O6 octahedra. All Bi(1)-O(1) bond lengths are 2.72 Å. All Bi(1)-O(2) bond lengths are 2.78 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(2), two equivalent Sr(1), one Ti(1), one 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), two equivalent Mn(1), and two equivalent Bi(1) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Ti(1) atoms.