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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba(Cu2As)4 by Materials Project

Ba(Cu2As)4 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Ba2+ is bonded in a body-centered cubic geometry to eight equivalent As3- atoms. All Ba–As bond lengths are 3.43 Å. There are two inequivalent Cu+1.25+ sites. In the first Cu+1.25+ site, Cu+1.25+ is bonded in a 3-coordinate geometry to three equivalent As3- atoms. There are one shorter (2.44 Å) and two longer (2.51 Å) Cu–As bond lengths. In the second Cu+1.25+ site, Cu+1.25+ is bonded in a 4-coordinate geometry to four equivalent As3- atoms. There are a spread of Cu–As bond distances ranging from 2.43–2.60 Å. As3- is bonded in a 9-coordinate geometry to two equivalent Ba2+ and seven Cu+1.25+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(Cu2As)2 by Materials Project

Ba(Cu2As)2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ba2+ is bonded to six equivalent As3- atoms to form edge-sharing BaAs6 octahedra. All Ba–As bond lengths are 3.30 Å. There are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded in a distorted trigonal planar geometry to three equivalent As3- atoms. All Cu–As bond lengths are 2.49 Å. In the second Cu1+ site, Cu1+ is bonded in a 1-coordinate geometry to four equivalent As3- atoms. There are one shorter (2.46 Å) and three longer (2.79 Å) Cu–As bond lengths. As3- is bonded in a 10-coordinate geometry to three equivalent Ba2+ and seven Cu1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(Cu3As)2 by Materials Project

BaCu6As2 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ba is bonded in a 8-coordinate geometry to eight equivalent Cu and eight equivalent As atoms. All Ba–Cu bond lengths are 3.61 Å. All Ba–As bond lengths are 3.43 Å. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a distorted bent 120 degrees geometry to two equivalent Ba, four Cu, and two equivalent As atoms. All Cu–Cu bond lengths are 2.54 Å. Both Cu–As bond lengths are 2.44 Å. In the second Cu site, Cu is bonded in a 10-coordinate geometry to eight equivalent Cu and two equivalent As atoms. Both Cu–As bond lengths are 2.65 Å. In the third Cu site, Cu is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. As is bonded in a 9-coordinate geometry to four equivalent Ba and five Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(CuAs)2 by Materials Project

BaCu2As2 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba2+ is bonded in a body-centered cubic geometry to eight equivalent As3- atoms. All Ba–As bond lengths are 3.42 Å. Cu2+ is bonded to four equivalent As3- atoms to form a mixture of corner and edge-sharing CuAs4 tetrahedra. All Cu–As bond lengths are 2.49 Å. As3- is bonded in a 8-coordinate geometry to four equivalent Ba2+ and four equivalent Cu2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on BaCuAs by Materials Project

BaCuAs crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ba2+ is bonded to six equivalent As3- atoms to form a mixture of face, edge, and corner-sharing BaAs6 octahedra. The corner-sharing octahedral tilt angles are 43°. All Ba–As bond lengths are 3.43 Å. Cu1+ is bonded in a trigonal planar geometry to three equivalent As3- atoms. All Cu–As bond lengths are 2.53 Å. As3- is bonded in a 3-coordinate geometry to six equivalent Ba2+ and three equivalent Cu1+ atoms.

36 MATERIALS SCIENCE↗