Materials Data on K4U(PO5)2 by Materials Project
K4U(PO5)2 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.75–3.02 Å. U6+ is bonded to six O2- atoms to form UO6 octahedra that share corners with four equivalent PO4 tetrahedra. There are two shorter (1.85 Å) and four longer (2.26 Å) U–O bond lengths. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two equivalent UO6 octahedra. The corner-sharing octahedral tilt angles are 40°. There is two shorter (1.53 Å) and two longer (1.59 Å) P–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent K1+ and one P5+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent K1+, one U6+, and one P5+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent K1+ and one U6+ atom.