Materials Data on NaNbO3 by Materials Project

Abstract

NaNbO3 crystallizes in the orthorhombic P222_1 space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Na–O bond distances ranging from 2.52–3.02 Å. In the second Na1+ site, Na1+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Na–O bond distances ranging from 2.52–3.02 Å. In the third Na1+ site, Na1+ is bonded to twelve O2- atoms to form NaO12 cuboctahedra that share corners with four equivalent NaO12 cuboctahedra, faces with four equivalent NaO12 cuboctahedra, and faces with eight NbO6 octahedra. There are a spread of Na–O bond distances ranging from 2.80–2.88 Å. In the fourth Na1+ site, Na1+ is bonded to twelve O2- atoms to form NaO12 cuboctahedra that share corners with four equivalent NaO12 cuboctahedra, faces with four equivalent NaO12 cuboctahedra, and faces with eight NbO6 octahedra. There are a spread of Na–O bond distances ranging from 2.81–2.87 Å. There are two inequivalent Nb5+ sites. In the first Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with six NbO6 octahedra and faces with four NaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 1–13°. There are a spread of Nb–O bond distances ranging from 1.90–2.15 Å. In the second Nb5+ site, Nb5+ is bonded to six O2- atoms to form NbO6 octahedra that share corners with six NbO6 octahedra and faces with four NaO12 cuboctahedra. The corner-sharing octahedra tilt angles range from 0–13°. There are a spread of Nb–O bond distances ranging from 1.90–2.15 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+ and two equivalent Nb5+ atoms. In the second O2- site, O2- is bonded in a 2-coordinate geometry to four Na1+ and two Nb5+ atoms. In the third O2- site, O2- is bonded in a 2-coordinate geometry to four Na1+ and two Nb5+ atoms. In the fourth O2- site, O2- is bonded in a distorted linear geometry to four Na1+ and two equivalent Nb5+ atoms. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to four Na1+ and two Nb5+ atoms. In the sixth O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+ and two equivalent Nb5+ atoms. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to four Na1+ and two Nb5+ atoms. In the eighth O2- site, O2- is bonded in a distorted linear geometry to four Na1+ and two equivalent Nb5+ atoms.