Materials Data on Na2SnO2 by Materials Project
Na2SnO2 crystallizes in the orthorhombic Pbcn space group. The structure is two-dimensional and consists of two Na2SnO2 sheets oriented in the (0, 0, 1) direction. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form edge-sharing NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.37–2.68 Å. In the second Na1+ site, Na1+ is bonded to six O2- atoms to form distorted edge-sharing NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.41–2.72 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 2.30–2.37 Å. Sn2+ is bonded in a distorted T-shaped geometry to three O2- atoms. There are a spread of Sn–O bond distances ranging from 2.04–2.16 Å. There are two inequivalent O2- sites. In the first 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 8–11°. In the second O2- site, O2- is bonded to four Na1+ and two equivalent Sn2+ atoms to form a mixture of distorted edge and corner-sharing ONa4Sn2 octahedra. The corner-sharing octahedra tilt angles range from 8–9°.