Materials Data on Na4CO4 by Materials Project

Abstract

Na4CO4 crystallizes in the trigonal R3 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.43–2.70 Å. In the second Na1+ site, Na1+ is bonded in a 1-coordinate geometry to one O2- atom. The Na–O bond length is 2.31 Å. C4+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All C–O bond lengths are 1.31 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to four equivalent Na1+ and one C4+ atom. In the second O2- site, O2- is bonded to seven Na1+ atoms to form distorted corner-sharing ONa7 pentagonal bipyramids.