K4SrU3O12 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Im-3m space group. K(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form KO12 cuboctahedra that share corners with twelve equivalent K(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, faces with two equivalent Sr(1)O6 octahedra, and faces with six equivalent U(1)O6 octahedra. Sr(1) is bonded to six equivalent O(1) atoms to form SrO6 octahedra that share corners with six equivalent U(1)O6 octahedra and faces with eight equivalent K(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. U(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form UO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent U(1)O6 octahedra, and faces with eight equivalent K(1)O12 cuboctahedra. 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 four equivalent K(1), one Sr(1), and one U(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to four equivalent K(1) and two equivalent U(1) atoms.
K4SrU3O12 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Im-3m space group. K(1) is bonded to six equivalent O(1) and six equivalent O(2) atoms to form KO12 cuboctahedra that share corners with twelve equivalent K(1)O12 cuboctahedra, faces with six equivalent K(1)O12 cuboctahedra, faces with two equivalent Sr(1)O6 octahedra, and faces with six equivalent U(1)O6 octahedra. All K(1)-O(1) bond lengths are 3.11 Å. All K(1)-O(2) bond lengths are 3.10 Å. Sr(1) is bonded to six equivalent O(1) atoms to form SrO6 octahedra that share corners with six equivalent U(1)O6 octahedra and faces with eight equivalent K(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. All Sr(1)-O(1) bond lengths are 2.44 Å. U(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form UO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent U(1)O6 octahedra, and faces with eight equivalent K(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Both U(1)-O(1) bond lengths are 1.95 Å. All U(1)-O(2) bond lengths are 2.19 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to four equivalent K(1), one Sr(1), and one U(1) atom. In the second O site, O(2) is bonded in a distorted linear geometry to four equivalent K(1) and two equivalent U(1) atoms.