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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Cu4As2O9 by Materials Project

Cu4As2O9 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are three inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded to five O2- atoms to form CuO5 trigonal bipyramids that share corners with two equivalent CuO5 square pyramids, corners with four AsO4 tetrahedra, edges with two equivalent CuO5 square pyramids, and an edgeedge with one CuO5 trigonal bipyramid. There are a spread of Cu–O bond distances ranging from 1.96–2.25 Å. In the second Cu2+ site, Cu2+ is bonded to five O2- atoms to form distorted CuO5 square pyramids that share a cornercorner with one CuO5 square pyramid, corners with four AsO4 tetrahedra, a cornercorner with one CuO5 trigonal bipyramid, an edgeedge with one CuO5 square pyramid, and edges with two CuO5 trigonal bipyramids. There are a spread of Cu–O bond distances ranging from 1.93–2.41 Å. In the third Cu2+ site, Cu2+ is bonded to five O2- atoms to form distorted CuO5 trigonal bipyramids that share corners with four AsO4 tetrahedra, edges with two equivalent CuO5 square pyramids, and an edgeedge with one CuO5 trigonal bipyramid. There are a spread of Cu–O bond distances ranging from 1.87–2.13 Å. There are two inequivalent As5+ sites. In the first As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four equivalent CuO5 square pyramids and corners with four CuO5 trigonal bipyramids. There are a spread of As–O bond distances ranging from 1.73–1.76 Å. In the second As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four equivalent CuO5 square pyramids and corners with four CuO5 trigonal bipyramids. There are a spread of As–O bond distances ranging from 1.69–1.75 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two Cu2+ and one As5+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two Cu2+ and one As5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two Cu2+ and one As5+ atom. In the fourth O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Cu2+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Cu2+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a bent 150 degrees geometry to one Cu2+ and one As5+ atom. In the seventh O2- site, O2- is bonded in a tetrahedral geometry to four Cu2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cu4As2O9 by Materials Project

Cu4As2O9 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are four inequivalent Cu2+ sites. In the first Cu2+ site, Cu2+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Cu–O bond distances ranging from 1.94–2.34 Å. In the second Cu2+ site, Cu2+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with five AsO4 tetrahedra, an edgeedge with one CuO6 octahedra, and an edgeedge with one CuO5 trigonal bipyramid. There are a spread of Cu–O bond distances ranging from 1.95–2.55 Å. In the third Cu2+ site, Cu2+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.94–1.96 Å. In the fourth Cu2+ site, Cu2+ is bonded to five O2- atoms to form distorted CuO5 trigonal bipyramids that share corners with four AsO4 tetrahedra and an edgeedge with one CuO6 octahedra. There are a spread of Cu–O bond distances ranging from 1.94–2.46 Å. There are two inequivalent As5+ sites. In the first As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with two equivalent CuO6 octahedra and corners with two equivalent CuO5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 57°. There are a spread of As–O bond distances ranging from 1.71–1.75 Å. In the second As5+ site, As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with three equivalent CuO6 octahedra and corners with two equivalent CuO5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 45–61°. There are a spread of As–O bond distances ranging from 1.71–1.78 Å. There are nine inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Cu2+ and one As5+ atom. In the second O2- site, O2- is bonded in a 2-coordinate geometry to two Cu2+ and one As5+ atom. In the third O2- site, O2- is bonded in a 2-coordinate geometry to two Cu2+ and one As5+ atom. In the fourth O2- site, O2- is bonded in a trigonal non-coplanar geometry to two Cu2+ and one As5+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Cu2+ and one As5+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Cu2+ and one As5+ atom. In the seventh O2- site, O2- is bonded in a tetrahedral geometry to four Cu2+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to two Cu2+ and one As5+ atom. In the ninth O2- site, O2- is bonded in a 3-coordinate geometry to two Cu2+ and one As5+ atom.

36 MATERIALS SCIENCE↗