DOI: 10.17188/1267978
title: Materials Data on Cu7As6(PbO12)2 by Materials Project

description: Pb2Cu7(AsO4)6 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are five inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded to five O2- atoms to form CuO5 trigonal bipyramids that share corners with five AsO4 tetrahedra and an edgeedge with one CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 1.94–2.18 Å. In the second Cu2+ site, Cu2+ is bonded to five O2- atoms to form CuO5 trigonal bipyramids that share a cornercorner with one CuO6 octahedra and corners with five AsO4 tetrahedra. The corner-sharing octahedral tilt angles are 76°. There are a spread of Cu–O bond distances ranging from 1.95–2.17 Å. In the third Cu2+ site, Cu2+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with six AsO4 tetrahedra, corners with two equivalent CuO5 trigonal bipyramids, and edges with two equivalent CuO5 trigonal bipyramids. There are a spread of Cu–O bond distances ranging from 1.98–2.64 Å. In the fourth Cu2+ site, Cu2+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.93 Å) and two longer (1.98 Å) Cu–O bond length. In the fifth Cu2+ site, Cu2+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.94 Å) and two longer (2.00 Å) Cu–O bond length. Pb2+ is bonded in a 7-coordinate geometry to eight O2- atoms. There are a spread of Pb–O bond distances ranging from 2.50–3.06 Å. There are three inequivalent As5+ sites. In the first As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share a cornercorner with one CuO6 octahedra and corners with three CuO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 62°. There are a spread of As–O bond distances ranging from 1.71–1.76 Å. In the second As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with three CuO5 trigonal bipyramids. There are a spread of As–O bond distances ranging from 1.71–1.77 Å. In the third As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with two equivalent CuO6 octahedra and corners with four CuO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 31–60°. There are a spread of As–O bond distances ranging from 1.71–1.77 Å. There are twelve inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two Cu2+ and one As5+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Cu2+ and one As5+ atom. In the third O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu2+, one Pb2+, and one As5+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to two Cu2+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a trigonal planar geometry to two Cu2+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu2+, one Pb2+, and one As5+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Pb2+ and one As5+ atom. In the eighth O2- site, O2- is bonded in a 2-coordinate geometry to one Cu2+, one Pb2+, and one As5+ atom. In the ninth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu2+, one Pb2+, and one As5+ atom. In the tenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cu2+, one Pb2+, and one As5+ atom. In the eleventh O2- site, O2- is bonded in a distorted trigonal planar geometry to two Cu2+, one Pb2+, and one As5+ atom. In the twelfth O2- site, O2- is bonded in a 3-coordinate geometry to two Cu2+ and one As5+ atom.