DOI: 10.17188/1752941
title: Materials Data on NaMg2Fe3P4(H9O13)2 by Materials Project

description: NaMg2Fe3P4(H9O13)2 crystallizes in the monoclinic P2/c space group. The structure is three-dimensional. Na1+ is bonded in a 4-coordinate geometry to four O2- atoms. There are two shorter (2.24 Å) and two longer (2.58 Å) Na–O bond lengths. There are two inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded in a square co-planar geometry to four O2- atoms. There are two shorter (1.90 Å) and two longer (2.25 Å) Mg–O bond lengths. In the second Mg2+ site, Mg2+ is bonded to four O2- atoms to form distorted MgO4 tetrahedra that share corners with two equivalent PHO3 tetrahedra. There are two shorter (2.00 Å) and two longer (2.01 Å) Mg–O bond lengths. There are three inequivalent Fe3+ sites. In the first Fe3+ site, Fe3+ is bonded in a square co-planar geometry to four O2- atoms. There are two shorter (1.93 Å) and two longer (2.18 Å) Fe–O bond lengths. In the second Fe3+ site, Fe3+ is bonded in a see-saw-like geometry to four O2- atoms. There are two shorter (1.99 Å) and two longer (2.14 Å) Fe–O bond lengths. In the third Fe3+ site, Fe3+ is bonded in a distorted square co-planar geometry to four O2- atoms. There are two shorter (2.01 Å) and two longer (2.08 Å) Fe–O bond lengths. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to one H1+ and three O2- atoms to form distorted PHO3 tetrahedra that share a cornercorner with one MgO4 tetrahedra and a cornercorner with one PO4 tetrahedra. The P–H bond length is 1.41 Å. There is two shorter (1.53 Å) and one longer (1.64 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form corner-sharing PO4 tetrahedra. There are a spread of P–O bond distances ranging from 1.51–1.62 Å. There are nine 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 0.97 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one P5+ atom. In the third 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 fourth 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 (1.65 Å) H–O bond length. In the fifth H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.05 Å) and one longer (1.52 Å) H–O bond length. In the sixth H1+ site, H1+ is bonded in a linear geometry to two O2- atoms. There is one shorter (1.05 Å) and one longer (1.45 Å) H–O bond length. 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. In the eighth 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 ninth 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 distorted single-bond geometry to one Fe3+ and one H1+ atom. In the second O2- site, O2- is bonded in a bent 120 degrees geometry to two P5+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to one Na1+, one Fe3+, and one H1+ atom. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one P5+ and one H1+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to one P5+ and two H1+ atoms. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Mg2+ and one H1+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Mg2+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to two Fe3+ and one H1+ atom. In the ninth O2- site, O2- is bonded in a distorted water-like geometry to one H1+ and one O2- atom. The O–O bond length is 1.35 Å. In the tenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Fe3+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one Na1+, one Mg2+, and one H1+ atom. In the twelfth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Fe3+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Mg2+ and two H1+ atoms.