Materials Data on NaAsO3 by Materials Project
NaAsO3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are three inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with five AsO4 tetrahedra, edges with four NaO6 octahedra, and an edgeedge with one AsO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.34–2.82 Å. In the second Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with five AsO4 tetrahedra, edges with four NaO6 octahedra, and an edgeedge with one AsO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.37–2.56 Å. In the third Na1+ site, Na1+ is bonded to six O2- atoms to form NaO6 octahedra that share corners with six AsO4 tetrahedra and edges with six NaO6 octahedra. There are a spread of Na–O bond distances ranging from 2.42–2.48 Å. There are three inequivalent As5+ sites. In the first As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four NaO6 octahedra, corners with two AsO4 tetrahedra, and edges with two NaO6 octahedra. The corner-sharing octahedra tilt angles range from 11–62°. There are a spread of As–O bond distances ranging from 1.67–1.81 Å. In the second As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with six NaO6 octahedra and corners with two AsO4 tetrahedra. The corner-sharing octahedra tilt angles range from 47–69°. There are a spread of As–O bond distances ranging from 1.67–1.80 Å. In the third As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with six NaO6 octahedra and corners with two AsO4 tetrahedra. The corner-sharing octahedra tilt angles range from 44–69°. There are a spread of As–O bond distances ranging from 1.66–1.81 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 120 degrees geometry to two As5+ atoms. In the second O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Na1+ and one As5+ atom. In the third O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Na1+ and one As5+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+ and two As5+ atoms. In the fifth O2- site, O2- is bonded to three Na1+ and one As5+ atom to form distorted edge-sharing ONa3As tetrahedra. In the sixth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Na1+ and one As5+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Na1+ and one As5+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+ and two As5+ atoms. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Na1+ and one As5+ atom.