SrMnO3 is (Cubic) Perovskite-like structured and crystallizes in the hexagonal P6_3mc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with four equivalent Mn(2)O6 octahedra. In the second Sr site, Sr(2) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Mn(1)O6 octahedra, and faces with three equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are two inequivalent Mn sites. In the first Mn site, 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 Sr(2)O12 cuboctahedra, corners with three equivalent Mn(2)O6 octahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and  a faceface with one Mn(2)O6 octahedra. The corner-sharing octahedra are not tilted. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Mn(1)O6 octahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and  a faceface with one Mn(1)O6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom.
SrMnO3 is (Cubic) Perovskite-like structured and crystallizes in the hexagonal P6_3mc space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Sr(1)O12 cuboctahedra, faces with six equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Mn(1)O6 octahedra, and faces with four equivalent Mn(2)O6 octahedra. There are three shorter (2.76 Å) and three longer (2.77 Å) Sr(1)-O(1) bond lengths. All Sr(1)-O(2) bond lengths are 2.73 Å. In the second Sr site, Sr(2) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form SrO12 cuboctahedra that share corners with six equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Mn(1)O6 octahedra, corners with three equivalent Mn(2)O6 octahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with six equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Mn(1)O6 octahedra, and faces with three equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. All Sr(2)-O(1) bond lengths are 2.73 Å. There are three shorter (2.84 Å) and three longer (2.85 Å) Sr(2)-O(2) bond lengths. There are two inequivalent Mn sites. In the first Mn site, 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 Sr(2)O12 cuboctahedra, corners with three equivalent Mn(2)O6 octahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and  a faceface with one Mn(2)O6 octahedra. The corner-sharing octahedra are not tilted. All Mn(1)-O(1) bond lengths are 1.88 Å. All Mn(1)-O(2) bond lengths are 1.90 Å. In the second Mn site, Mn(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Mn(1)O6 octahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with four equivalent Sr(1)O12 cuboctahedra, and  a faceface with one Mn(1)O6 octahedra. The corner-sharing octahedra are not tilted. All Mn(2)-O(1) bond lengths are 1.88 Å. All Mn(2)-O(2) bond lengths are 1.90 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom.