K2UO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. U(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing UO6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(2) is bonded to five equivalent K(1) and one U(1) atom to form distorted OK5U octahedra that share corners with five equivalent O(2)K5U octahedra, corners with twelve equivalent O(1)K4U2 octahedra, edges with eight equivalent O(2)K5U octahedra, and faces with four equivalent O(1)K4U2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the second O site, O(1) is bonded to four equivalent K(1) and two equivalent U(1) atoms to form distorted OK4U2 octahedra that share corners with two equivalent O(1)K4U2 octahedra, corners with twelve equivalent O(2)K5U octahedra, edges with two equivalent O(1)K4U2 octahedra, faces with four equivalent O(1)K4U2 octahedra, and faces with four equivalent O(2)K5U octahedra. The corner-sharing octahedral tilt angles range from 0-60°.
K2UO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. All K(1)-O(1) bond lengths are 2.96 Å. There is one shorter (2.67 Å) and four longer (3.06 Å) K(1)-O(2) bond lengths. U(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form corner-sharing UO6 octahedra. The corner-sharing octahedra are not tilted. Both U(1)-O(2) bond lengths are 1.93 Å. All U(1)-O(1) bond lengths are 2.16 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded to five equivalent K(1) and one U(1) atom to form distorted OK5U octahedra that share corners with five equivalent O(2)K5U octahedra, corners with twelve equivalent O(1)K4U2 octahedra, edges with eight equivalent O(2)K5U octahedra, and faces with four equivalent O(1)K4U2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the second O site, O(1) is bonded to four equivalent K(1) and two equivalent U(1) atoms to form distorted OK4U2 octahedra that share corners with two equivalent O(1)K4U2 octahedra, corners with twelve equivalent O(2)K5U octahedra, edges with two equivalent O(1)K4U2 octahedra, faces with four equivalent O(1)K4U2 octahedra, and faces with four equivalent O(2)K5U octahedra. The corner-sharing octahedral tilt angles range from 0-60°.