DOI: 10.17188/1199895
title: Materials Data on Mg2PHO5 by Materials Project

description: Mg2(PO4)OH crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are eight inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 trigonal bipyramids that share a cornercorner with one MgO6 octahedra, corners with four PO4 tetrahedra, corners with two MgO5 trigonal bipyramids, and an edgeedge with one MgO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 52°. There are a spread of Mg–O bond distances ranging from 2.01–2.11 Å. In the second Mg2+ site, Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with four PO4 tetrahedra, corners with two MgO5 trigonal bipyramids, and an edgeedge with one MgO6 octahedra. There are a spread of Mg–O bond distances ranging from 2.08–2.19 Å. In the third Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 trigonal bipyramids that share a cornercorner with one MgO6 octahedra, corners with four PO4 tetrahedra, corners with two MgO5 trigonal bipyramids, and an edgeedge with one MgO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are a spread of Mg–O bond distances ranging from 2.01–2.08 Å. In the fourth Mg2+ site, Mg2+ is bonded to six O2- atoms to form MgO6 octahedra that share corners with four PO4 tetrahedra, corners with two MgO5 trigonal bipyramids, and an edgeedge with one MgO5 trigonal bipyramid. There are a spread of Mg–O bond distances ranging from 2.08–2.19 Å. In the fifth Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 trigonal bipyramids that share a cornercorner with one MgO6 octahedra, corners with four PO4 tetrahedra, corners with two MgO5 trigonal bipyramids, and an edgeedge with one MgO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 53°. There are a spread of Mg–O bond distances ranging from 2.01–2.12 Å. In the sixth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Mg–O bond distances ranging from 2.08–2.25 Å. In the seventh Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 trigonal bipyramids that share a cornercorner with one MgO6 octahedra, corners with four PO4 tetrahedra, corners with two MgO5 trigonal bipyramids, and an edgeedge with one MgO5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 55°. There are a spread of Mg–O bond distances ranging from 2.01–2.16 Å. In the eighth Mg2+ site, Mg2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Mg–O bond distances ranging from 2.08–2.31 Å. There are four inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three MgO6 octahedra and corners with three MgO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 40–53°. There is three shorter (1.55 Å) and one longer (1.57 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one MgO6 octahedra and corners with five MgO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°. There is one shorter (1.55 Å) and three longer (1.56 Å) P–O bond length. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share a cornercorner with one MgO6 octahedra and corners with six MgO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 42°. There is two shorter (1.55 Å) and two longer (1.56 Å) P–O bond length. In the fourth P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three MgO6 octahedra and corners with two MgO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 42–57°. There are a spread of P–O bond distances ranging from 1.55–1.57 Å. There are four 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 0.98 Å. 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. In the third 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 fourth 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 twenty inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three Mg2+ and one H1+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to three Mg2+ and one H1+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to three Mg2+ and one H1+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to three Mg2+ and one H1+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two Mg2+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two Mg2+ and one P5+ atom. In the tenth O2- site, O2- is bonded in a trigonal planar geometry to two Mg2+ and one P5+ atom. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to two Mg2+ and one P5+ atom. In the thirteenth O2- site, O2- is bonded in a 3-coordinate geometry to two Mg2+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the fifteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the sixteenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Mg2+ and one P5+ atom. In the seventeenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the eighteenth O2- site, O2- is bonded in a 3-coordinate geometry to two Mg2+ and one P5+ atom. In the nineteenth O2- site, O2- is bonded in a trigonal planar geometry to two Mg2+ and one P5+ atom. In the twentieth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Mg2+ and one P5+ atom.