Materials Data on Na4SnO3 by Materials Project
Na4SnO3 crystallizes in the monoclinic Cc space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to five O2- atoms to form a mixture of distorted edge and corner-sharing NaO5 square pyramids. There are a spread of Na–O bond distances ranging from 2.41–2.77 Å. In the second Na1+ site, Na1+ is bonded to five O2- atoms to form a mixture of edge and corner-sharing NaO5 square pyramids. There are a spread of Na–O bond distances ranging from 2.39–2.62 Å. In the third Na1+ site, Na1+ is bonded in a trigonal non-coplanar geometry to three O2- atoms. There are a spread of Na–O bond distances ranging from 2.27–2.30 Å. In the fourth Na1+ site, Na1+ is bonded in a bent 150 degrees geometry to two equivalent O2- atoms. There are one shorter (2.28 Å) and one longer (2.29 Å) Na–O bond lengths. Sn2+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are one shorter (2.05 Å) and two longer (2.06 Å) Sn–O bond lengths. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to five Na1+ and one Sn2+ atom. In the second O2- site, O2- is bonded to five Na1+ and one Sn2+ atom to form a mixture of distorted edge and corner-sharing ONa5Sn octahedra. The corner-sharing octahedra tilt angles range from 17–26°. In the third O2- site, O2- is bonded to five Na1+ and one Sn2+ atom to form a mixture of edge and corner-sharing ONa5Sn octahedra. The corner-sharing octahedra tilt angles range from 17–26°.