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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Na6Cu2As(CO4)4 by Materials Project

Na6Cu2As(CO4)4 crystallizes in the cubic Fd-3 space group. The structure is three-dimensional. Na1+ is bonded to six O2- atoms to form distorted NaO6 octahedra that share corners with eight equivalent NaO6 octahedra, edges with two equivalent CuO6 octahedra, and an edgeedge with one AsO4 tetrahedra. The corner-sharing octahedra tilt angles range from 60–86°. There are a spread of Na–O bond distances ranging from 2.41–2.46 Å. Cu+2.50+ is bonded to six equivalent O2- atoms to form CuO6 octahedra that share edges with six equivalent NaO6 octahedra. All Cu–O bond lengths are 2.10 Å. C4+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All C–O bond lengths are 1.29 Å. As5+ is bonded to four equivalent O2- atoms to form AsO4 tetrahedra that share edges with six equivalent NaO6 octahedra. All As–O bond lengths are 1.71 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na1+, one Cu+2.50+, and one C4+ atom. In the second O2- site, O2- is bonded to three equivalent Na1+ and one As5+ atom to form distorted edge-sharing ONa3As trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na2CuAsCO7 by Materials Project

Na2CuCAsO7 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.28–2.68 Å. Cu3+ is bonded to six O2- atoms to form distorted CuO6 octahedra that share corners with four equivalent AsO4 tetrahedra. There are a spread of Cu–O bond distances ranging from 2.00–2.24 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.26 Å) and two longer (1.30 Å) C–O bond length. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four equivalent CuO6 octahedra. The corner-sharing octahedra tilt angles range from 46–59°. There are a spread of As–O bond distances ranging from 1.71–1.74 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Na1+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal pyramidal geometry to two equivalent Na1+, one Cu3+, and one C4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Na1+, one Cu3+, and one C4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to one Na1+, one Cu3+, and one As5+ atom. In the fifth O2- site, O2- is bonded in a rectangular see-saw-like geometry to two equivalent Na1+, one Cu3+, and one As5+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Na1+, one Cu3+, and one As5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Na3CuAsCO7 by Materials Project

Na3CuCAsO7 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Na–O bond distances ranging from 2.41–2.71 Å. In the second Na1+ site, Na1+ is bonded to seven O2- atoms to form distorted NaO7 pentagonal bipyramids that share corners with two equivalent NaO7 pentagonal bipyramids, corners with two equivalent AsO4 tetrahedra, an edgeedge with one NaO7 pentagonal bipyramid, an edgeedge with one AsO4 tetrahedra, and a faceface with one NaO7 pentagonal bipyramid. There are a spread of Na–O bond distances ranging from 2.26–2.89 Å. Cu2+ is bonded in a 5-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.99–2.60 Å. C4+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.29 Å) and one longer (1.32 Å) C–O bond length. As5+ is bonded to four O2- atoms to form AsO4 tetrahedra that share corners with four equivalent NaO7 pentagonal bipyramids and edges with two equivalent NaO7 pentagonal bipyramids. There are a spread of As–O bond distances ranging from 1.69–1.75 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 5-coordinate geometry to four Na1+ and one C4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Cu2+, and one C4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three Na1+, one Cu2+, and one C4+ atom. In the fourth O2- site, O2- is bonded in a 5-coordinate geometry to three Na1+, one Cu2+, and one As5+ atom. In the fifth O2- site, O2- is bonded in a distorted tetrahedral geometry to two equivalent Na1+, one Cu2+, and one As5+ atom. In the sixth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to two equivalent Na1+, one Cu2+, and one As5+ atom.

36 MATERIALS SCIENCE↗