DOI: 10.17188/1288230
title: Materials Data on Fe6P4H17O27 by Materials Project

description: Fe6P4H13O25(H2O)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional and consists of eight water molecules and one Fe6P4H13O25 framework. In the Fe6P4H13O25 framework, there are four inequivalent Fe+2.83+ sites. In the first Fe+2.83+ site, Fe+2.83+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra and corners with two equivalent PO4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. There are four shorter (1.99 Å) and two longer (2.17 Å) Fe–O bond lengths. In the second Fe+2.83+ site, Fe+2.83+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra, corners with four equivalent PO4 tetrahedra, and faces with two equivalent FeO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Fe–O bond distances ranging from 2.09–2.14 Å. In the third Fe+2.83+ site, Fe+2.83+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with three FeO6 octahedra and corners with three PO4 tetrahedra. The corner-sharing octahedra tilt angles range from 50–53°. There are a spread of Fe–O bond distances ranging from 1.95–2.14 Å. In the fourth Fe+2.83+ site, Fe+2.83+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with two FeO6 octahedra, corners with four PO4 tetrahedra, and a faceface with one FeO6 octahedra. The corner-sharing octahedra tilt angles range from 44–50°. There are a spread of Fe–O bond distances ranging from 1.96–2.15 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 six FeO6 octahedra. The corner-sharing octahedra tilt angles range from 30–54°. There are a spread of P–O bond distances ranging from 1.53–1.56 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four FeO6 octahedra. The corner-sharing octahedra tilt angles range from 43–53°. There are a spread of P–O bond distances ranging from 1.54–1.57 Å. There are seven inequivalent H1+ sites. In the first 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 second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 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 1.00 Å. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the seventh 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 thirteen inequivalent O2- sites. In the first O2- site, O2- is bonded in a 2-coordinate geometry to one Fe+2.83+ and one P5+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Fe+2.83+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Fe+2.83+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three Fe+2.83+ and one H1+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two Fe+2.83+ and one H1+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe+2.83+ and one H1+ atom. In the seventh O2- site, O2- is bonded in a distorted water-like geometry to one Fe+2.83+ and two H1+ atoms. In the eighth O2- site, O2- is bonded in a distorted water-like geometry to one Fe+2.83+ and two H1+ atoms. In the ninth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Fe+2.83+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a 3-coordinate geometry to two Fe+2.83+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a 3-coordinate geometry to two Fe+2.83+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a bent 150 degrees geometry to one Fe+2.83+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Fe+2.83+ and one P5+ atom.