Materials Data on Na2W4O13 by Materials Project
Na2W4O13 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.38–2.82 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedra tilt angles range from 0–21°. There are a spread of W–O bond distances ranging from 1.79–2.18 Å. In the second W6+ site, W6+ is bonded to six O2- atoms to form a mixture of distorted edge and corner-sharing WO6 octahedra. The corner-sharing octahedra tilt angles range from 8–21°. There are a spread of W–O bond distances ranging from 1.78–2.30 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to three W6+ atoms. In the second O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms. In the third O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms. In the fourth O2- site, O2- is bonded in a linear geometry to two equivalent W6+ atoms. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Na1+ and one W6+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Na1+ and one W6+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+ and two W6+ atoms.