Materials Data on NaAlF4 by Materials Project

Abstract

NaAlF4 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six equivalent F1- atoms. There are four shorter (2.33 Å) and two longer (2.41 Å) Na–F bond lengths. Al3+ is bonded to six F1- atoms to form corner-sharing AlF6 octahedra. The corner-sharing octahedra tilt angles range from 0–4°. There are a spread of Al–F bond distances ranging from 1.80–1.85 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a 4-coordinate geometry to three equivalent Na1+ and one Al3+ atom. In the second F1- site, F1- is bonded in a linear geometry to two equivalent Al3+ atoms. In the third F1- site, F1- is bonded in a linear geometry to two equivalent Al3+ atoms.