DOI: 10.17188/1318652
title: Materials Data on Mg3Bi2(PO6)2 by Materials Project

description: Mg3Bi2(PO6)2 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are six inequivalent Mg2+ sites. In the first Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 square pyramids that share corners with three PO4 tetrahedra and an edgeedge with one MgO5 trigonal bipyramid. There are a spread of Mg–O bond distances ranging from 1.95–2.06 Å. In the second Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 square pyramids that share corners with three PO4 tetrahedra and an edgeedge with one MgO5 trigonal bipyramid. There are a spread of Mg–O bond distances ranging from 1.97–2.07 Å. In the third Mg2+ site, Mg2+ is bonded to five O2- atoms to form distorted MgO5 trigonal bipyramids that share corners with two equivalent MgO5 square pyramids, corners with three PO4 tetrahedra, and an edgeedge with one MgO5 square pyramid. There are a spread of Mg–O bond distances ranging from 2.04–2.11 Å. In the fourth Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 square pyramids that share corners with three PO4 tetrahedra and corners with two equivalent MgO5 trigonal bipyramids. There are a spread of Mg–O bond distances ranging from 2.03–2.10 Å. In the fifth Mg2+ site, Mg2+ is bonded to five O2- atoms to form MgO5 square pyramids that share corners with three PO4 tetrahedra and corners with two equivalent MgO5 trigonal bipyramids. There are a spread of Mg–O bond distances ranging from 2.01–2.10 Å. In the sixth Mg2+ site, Mg2+ is bonded to five O2- atoms to form distorted MgO5 trigonal bipyramids that share corners with two equivalent MgO5 square pyramids, corners with three PO4 tetrahedra, and an edgeedge with one MgO5 square pyramid. There are a spread of Mg–O bond distances ranging from 2.03–2.10 Å. There are four inequivalent Bi4+ sites. In the first Bi4+ site, Bi4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are two shorter (2.22 Å) and two longer (2.23 Å) Bi–O bond lengths. In the second Bi4+ site, Bi4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are two shorter (2.20 Å) and two longer (2.26 Å) Bi–O bond lengths. In the third Bi4+ site, Bi4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are two shorter (2.21 Å) and two longer (2.28 Å) Bi–O bond lengths. In the fourth Bi4+ site, Bi4+ is bonded in a 4-coordinate geometry to four O2- atoms. There are two shorter (2.23 Å) and two longer (2.24 Å) Bi–O bond lengths. 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 MgO5 square pyramids and a cornercorner with one MgO5 trigonal bipyramid. There is one shorter (1.54 Å) and three longer (1.55 Å) P–O bond length. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three MgO5 square pyramids and corners with two equivalent MgO5 trigonal bipyramids. There is two shorter (1.54 Å) and two longer (1.57 Å) P–O bond length. In the third P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with three MgO5 square pyramids and corners with two equivalent MgO5 trigonal bipyramids. There is two shorter (1.54 Å) and two longer (1.57 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 MgO5 square pyramids and a cornercorner with one MgO5 trigonal bipyramid. There is one shorter (1.54 Å) and three longer (1.55 Å) P–O bond length. There are sixteen inequivalent O2- sites. In the first O2- site, O2- is bonded to two Mg2+ and two Bi4+ atoms to form distorted edge-sharing OMg2Bi2 tetrahedra. In the second O2- site, O2- is bonded in a trigonal non-coplanar geometry to one Mg2+ and two Bi4+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Mg2+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a linear geometry to one Mg2+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to one Mg2+ and one P5+ atom. In the seventh O2- site, O2- is bonded in a linear geometry to one Mg2+ and one P5+ atom. In the eighth O2- site, O2- is bonded in a bent 150 degrees geometry to one Mg2+ and one P5+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the tenth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Mg2+ and one P5+ atom. In the eleventh O2- site, O2- is bonded to two Mg2+ and two Bi4+ atoms to form distorted edge-sharing OMg2Bi2 tetrahedra. In the twelfth O2- site, O2- is bonded in a trigonal non-coplanar geometry to one Mg2+ and two Bi4+ atoms. In the thirteenth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Mg2+ and one P5+ atom. In the fourteenth O2- site, O2- is bonded in a single-bond geometry to one P5+ atom. In the fifteenth O2- site, O2- is bonded in a bent 150 degrees geometry to one Mg2+ and one P5+ atom. In the sixteenth O2- site, O2- is bonded in a linear geometry to one Mg2+ and one P5+ atom.