DOI: 10.17188/1269458
title: Materials Data on Na2LiAlP2H2O9 by Materials Project

description: LiNa2HAl(PO4)2(OH) crystallizes in the orthorhombic Pcca space group. The structure is three-dimensional. there are four inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.35–2.86 Å. In the second Na1+ site, Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na–O bond distances ranging from 2.25–2.83 Å. In the third Na1+ site, Na1+ is bonded to eight O2- atoms to form distorted NaO8 hexagonal bipyramids that share edges with two equivalent AlO6 octahedra and edges with four PO4 tetrahedra. There are a spread of Na–O bond distances ranging from 2.30–2.61 Å. In the fourth Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.36–2.50 Å. Li1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 1.90–2.33 Å. There are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to six O2- atoms to form AlO6 octahedra that share corners with two equivalent AlO6 octahedra and corners with four PO4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. There are a spread of Al–O bond distances ranging from 1.91–1.95 Å. In the second Al3+ site, Al3+ is bonded to six O2- atoms to form AlO6 octahedra that share corners with two equivalent AlO6 octahedra, corners with four PO4 tetrahedra, and edges with two equivalent NaO8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. There are a spread of Al–O bond distances ranging from 1.91–1.95 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two AlO6 octahedra and an edgeedge with one NaO8 hexagonal bipyramid. The corner-sharing octahedra tilt angles range from 39–45°. There is one shorter (1.53 Å) and three longer (1.56 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with two AlO6 octahedra and an edgeedge with one NaO8 hexagonal bipyramid. The corner-sharing octahedra tilt angles range from 39–43°. There are a spread of P–O bond distances ranging from 1.52–1.57 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.20 Å) and one longer (1.24 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+, one Li1+, one Al3+, and one P5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Na1+, one Al3+, and one P5+ atom. In the third O2- site, O2- is bonded to two Na1+, one Li1+, and one P5+ atom to form distorted corner-sharing ONa2LiP tetrahedra. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Li1+, two Al3+, and one H1+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to one Na1+, one Li1+, one Al3+, and one P5+ atom. In the sixth O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+, one P5+, and one H1+ atom. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Na1+, one Al3+, and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two Na1+, one P5+, and one H1+ atom. In the ninth O2- site, O2- is bonded to two Na1+, one Li1+, and one P5+ atom to form distorted corner-sharing ONa2LiP trigonal pyramids.