Materials Data on NaNb(OF)2 by Materials Project

Abstract

NaNbO2F2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to one O2- and five F1- atoms. The Na–O bond length is 2.57 Å. There are a spread of Na–F bond distances ranging from 2.29–2.82 Å. Nb5+ is bonded to four O2- and two F1- atoms to form distorted corner-sharing NbO4F2 octahedra. The corner-sharing octahedra tilt angles range from 31–32°. There are a spread of Nb–O bond distances ranging from 1.84–2.20 Å. There are one shorter (2.05 Å) and one longer (2.08 Å) Nb–F bond lengths. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Nb5+ atoms. In the second O2- site, O2- is bonded in a 1-coordinate geometry to one Na1+ and two equivalent Nb5+ atoms. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a 3-coordinate geometry to three equivalent Na1+ and one Nb5+ atom. In the second F1- site, F1- is bonded in a distorted trigonal planar geometry to two equivalent Na1+ and one Nb5+ atom.