Materials Data on Na3AsO4 by Materials Project

Abstract

Na3AsO4 is Enargite structured and crystallizes in the orthorhombic Pmn2_1 space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded to four O2- atoms to form NaO4 tetrahedra that share corners with four equivalent AsO4 tetrahedra and corners with eight equivalent NaO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.30–2.39 Å. In the second Na1+ site, Na1+ is bonded to four O2- atoms to form NaO4 tetrahedra that share corners with four equivalent AsO4 tetrahedra and corners with eight NaO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.28–2.33 Å. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with twelve NaO4 tetrahedra. All As–O bond lengths are 1.73 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to three Na1+ and one As5+ atom to form distorted corner-sharing ONa3As tetrahedra. In the second O2- site, O2- is bonded to three Na1+ and one As5+ atom to form distorted corner-sharing ONa3As tetrahedra. In the third O2- site, O2- is bonded to three Na1+ and one As5+ atom to form distorted corner-sharing ONa3As tetrahedra.