Materials Data on KU2F9 by Materials Project
KU2F9 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. K1+ is bonded in a 6-coordinate geometry to six F1- atoms. There are a spread of K–F bond distances ranging from 2.64–2.77 Å. U4+ is bonded in a 9-coordinate geometry to nine F1- atoms. There are a spread of U–F bond distances ranging from 2.29–2.44 Å. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a linear geometry to two equivalent U4+ atoms. In the second F1- site, F1- is bonded in a bent 150 degrees geometry to two equivalent U4+ atoms. In the third F1- site, F1- is bonded in a distorted trigonal planar geometry to one K1+ and two equivalent U4+ atoms. In the fourth F1- site, F1- is bonded in a trigonal planar geometry to one K1+ and two equivalent U4+ atoms. In the fifth F1- site, F1- is bonded in a 3-coordinate geometry to one K1+ and two equivalent U4+ atoms.