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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on K2UF6 by Materials Project

K2UF6 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. K1+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are three shorter (2.65 Å) and six longer (2.89 Å) K–F bond lengths. U4+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are three shorter (2.27 Å) and six longer (2.40 Å) U–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded to two equivalent K1+ and two equivalent U4+ atoms to form a mixture of corner and edge-sharing FK2U2 tetrahedra. In the second F1- site, F1- is bonded in a 1-coordinate geometry to four equivalent K1+ and one U4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K2UF6 by Materials Project

K2UF6 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. K1+ is bonded in a body-centered cubic geometry to eight F1- atoms. There are a spread of K–F bond distances ranging from 2.71–2.81 Å. U4+ is bonded in a body-centered cubic geometry to eight F1- atoms. There are four shorter (2.22 Å) and four longer (2.41 Å) U–F bond lengths. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded to three equivalent K1+ and one U4+ atom to form a mixture of distorted edge and corner-sharing FK3U tetrahedra. In the second F1- site, F1- is bonded to two equivalent K1+ and two equivalent U4+ atoms to form a mixture of distorted edge and corner-sharing FK2U2 tetrahedra.

36 MATERIALS SCIENCE↗