Materials Data on LiAlSiH2O5 by Materials Project

Abstract

LiAlSiH2O5 crystallizes in the orthorhombic Pna2_1 space group. The structure is three-dimensional. Li1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Li–O bond distances ranging from 2.07–2.58 Å. Al3+ is bonded to four O2- atoms to form AlO4 tetrahedra that share corners with two equivalent SiO4 tetrahedra and an edgeedge with one SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.72–1.83 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent AlO4 tetrahedra and an edgeedge with one AlO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.71 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a distorted single-bond geometry to two O2- atoms. There is one shorter (1.02 Å) and one longer (1.62 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 five inequivalent O2- sites. In the first O2- site, O2- is bonded in a bent 150 degrees geometry to one Al3+ and one Si4+ atom. In the second O2- site, O2- is bonded to two equivalent Li1+ and two H1+ atoms to form distorted OLi2H2 tetrahedra that share corners with two equivalent OLi2H2 tetrahedra and corners with three equivalent OLiAlSiH trigonal pyramids. In the third O2- site, O2- is bonded to one Li1+, one Al3+, one Si4+, and one H1+ atom to form distorted corner-sharing OLiAlSiH trigonal pyramids. In the fourth O2- site, O2- is bonded in a T-shaped geometry to one Li1+, one Al3+, and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one Al3+, and one Si4+ atom.