DOI: 10.17188/1299903
title: Materials Data on Li2FeH4(SO5)2 by Materials Project

description: Li2FeH4(SO5)2 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one Li2FeH4(SO5)2 sheet oriented in the (0, 1, 0) direction. there are two inequivalent Li1+ sites. In the first Li1+ site, Li1+ is bonded in a 2-coordinate geometry to four O2- atoms. There are a spread of Li–O bond distances ranging from 1.97–2.78 Å. In the second Li1+ site, Li1+ is bonded to five O2- atoms to form distorted LiO5 square pyramids that share corners with two SO4 tetrahedra, edges with two equivalent FeO6 octahedra, and an edgeedge with one SO4 tetrahedra. There are a spread of Li–O bond distances ranging from 2.02–2.38 Å. Fe2+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four SO4 tetrahedra and edges with two equivalent LiO5 square pyramids. There are a spread of Fe–O bond distances ranging from 2.06–2.23 Å. There are four 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 (1.01 Å) and one longer (1.67 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 0.99 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are two inequivalent S6+ sites. In the first S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent FeO6 octahedra, a cornercorner with one LiO5 square pyramid, and an edgeedge with one LiO5 square pyramid. The corner-sharing octahedra tilt angles range from 38–54°. There are a spread of S–O bond distances ranging from 1.45–1.51 Å. In the second S6+ site, S6+ is bonded to four O2- atoms to form SO4 tetrahedra that share corners with two equivalent FeO6 octahedra and a cornercorner with one LiO5 square pyramid. The corner-sharing octahedra tilt angles range from 41–55°. There are a spread of S–O bond distances ranging from 1.48–1.51 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one S6+ atom. In the second O2- site, O2- is bonded in a distorted tetrahedral geometry to one Li1+, one Fe2+, and two H1+ atoms. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one S6+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Li1+, one H1+, and one S6+ atom. In the fifth O2- site, O2- is bonded in a distorted water-like geometry to one Li1+ and one S6+ atom. In the sixth O2- site, O2- is bonded in a distorted T-shaped geometry to one Li1+, one Fe2+, and one S6+ atom. In the seventh O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Fe2+, and one S6+ atom. In the eighth O2- site, O2- is bonded in a 3-coordinate geometry to one Li1+, one Fe2+, and one S6+ atom. In the ninth O2- site, O2- is bonded in a 4-coordinate geometry to two Li1+, one Fe2+, and one S6+ atom. In the tenth O2- site, O2- is bonded in a 2-coordinate geometry to one Li1+, one Fe2+, and two H1+ atoms.