Materials Data on Na6CoS4 by Materials Project

Abstract

Na6CoS4 crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to four S2- atoms to form distorted NaS4 tetrahedra that share corners with two equivalent CoS4 tetrahedra, corners with eight equivalent NaS4 tetrahedra, and an edgeedge with one CoS4 tetrahedra. There are a spread of Na–S bond distances ranging from 2.77–2.89 Å. In the second Na1+ site, Na1+ is bonded in a 5-coordinate geometry to six S2- atoms. There are a spread of Na–S bond distances ranging from 2.85–3.41 Å. Co2+ is bonded to four S2- atoms to form CoS4 tetrahedra that share corners with six equivalent NaS4 tetrahedra and edges with three equivalent NaS4 tetrahedra. There are one shorter (2.32 Å) and three longer (2.33 Å) Co–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 8-coordinate geometry to seven Na1+ and one Co2+ atom. In the second S2- site, S2- is bonded in a 7-coordinate geometry to nine Na1+ and one Co2+ atom.