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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on BaHo2CuO5 by Materials Project

Ho2BaCuO5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ba2+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Ba–O bond distances ranging from 2.64–3.30 Å. There are two inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded to seven O2- atoms to form distorted HoO7 pentagonal bipyramids that share corners with five equivalent CuO5 square pyramids, edges with five HoO7 pentagonal bipyramids, an edgeedge with one CuO5 square pyramid, and a faceface with one HoO7 pentagonal bipyramid. There are a spread of Ho–O bond distances ranging from 2.27–2.39 Å. In the second Ho3+ site, Ho3+ is bonded to seven O2- atoms to form distorted HoO7 pentagonal bipyramids that share corners with four equivalent HoO7 pentagonal bipyramids, edges with three equivalent HoO7 pentagonal bipyramids, edges with two equivalent CuO5 square pyramids, a faceface with one HoO7 pentagonal bipyramid, and a faceface with one CuO5 square pyramid. There are a spread of Ho–O bond distances ranging from 2.29–2.38 Å. Cu2+ is bonded to five O2- atoms to form CuO5 square pyramids that share corners with five equivalent HoO7 pentagonal bipyramids, edges with three HoO7 pentagonal bipyramids, and a faceface with one HoO7 pentagonal bipyramid. There are a spread of Cu–O bond distances ranging from 2.00–2.31 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to three equivalent Ba2+, two Ho3+, and one Cu2+ atom to form a mixture of distorted edge and corner-sharing OBa3Ho2Cu octahedra. The corner-sharing octahedral tilt angles are 5°. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+, three Ho3+, and one Cu2+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+, three Ho3+, and one Cu2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2Ho(CuO2)3 by Materials Project

Ba2Ho(CuO2)3 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ba2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are four shorter (2.80 Å) and four longer (2.96 Å) Ba–O bond lengths. Ho3+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Ho–O bond lengths are 2.42 Å. There are two inequivalent Cu+1.67+ sites. In the first Cu+1.67+ site, Cu+1.67+ is bonded to five O2- atoms to form distorted corner-sharing CuO5 square pyramids. There are four shorter (1.95 Å) and one longer (2.63 Å) Cu–O bond lengths. In the second Cu+1.67+ site, Cu+1.67+ is bonded in a linear geometry to two equivalent O2- atoms. Both Cu–O bond lengths are 1.81 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 6-coordinate geometry to two equivalent Ba2+, two equivalent Ho3+, and two equivalent Cu+1.67+ atoms. In the second O2- site, O2- is bonded in a 6-coordinate geometry to four equivalent Ba2+ and two Cu+1.67+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2Ho(CuO2)4 by Materials Project

HoBa2Cu4O8 crystallizes in the orthorhombic Cmmm space group. The structure is three-dimensional. Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.76–3.02 Å. Ho3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.40 Å) and four longer (2.41 Å) Ho–O bond lengths. There are two inequivalent Cu+2.25+ sites. In the first Cu+2.25+ site, Cu+2.25+ is bonded to five O2- atoms to form corner-sharing CuO5 square pyramids. There are four shorter (1.96 Å) and one longer (2.32 Å) Cu–O bond lengths. In the second Cu+2.25+ site, Cu+2.25+ is bonded in a square co-planar geometry to four O2- atoms. There are a spread of Cu–O bond distances ranging from 1.85–1.95 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted T-shaped geometry to two equivalent Ba2+ and three equivalent Cu+2.25+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+, two equivalent Ho3+, and two equivalent Cu+2.25+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+, two equivalent Ho3+, and two equivalent Cu+2.25+ atoms. In the fourth O2- site, O2- is bonded to four equivalent Ba2+ and two Cu+2.25+ atoms to form a mixture of distorted edge and corner-sharing OBa4Cu2 octahedra. The corner-sharing octahedral tilt angles are 11°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba2HoCu3O7 by Materials Project

HoBa2Cu3O7 crystallizes in the orthorhombic Pmmm space group. The structure is three-dimensional. Ba2+ is bonded in a 10-coordinate geometry to ten O2- atoms. There are a spread of Ba–O bond distances ranging from 2.75–3.06 Å. Ho3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.39 Å) and four longer (2.41 Å) Ho–O bond lengths. There are two inequivalent Cu+2.33+ sites. In the first Cu+2.33+ site, Cu+2.33+ is bonded to five O2- atoms to form corner-sharing CuO5 square pyramids. There are a spread of Cu–O bond distances ranging from 1.94–2.30 Å. In the second Cu+2.33+ site, Cu+2.33+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.88 Å) and two longer (1.96 Å) Cu–O bond length. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted linear geometry to four equivalent Ba2+ and two equivalent Cu+2.33+ atoms. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+, two equivalent Ho3+, and two equivalent Cu+2.33+ atoms. In the third O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ba2+, two equivalent Ho3+, and two equivalent Cu+2.33+ atoms. In the fourth O2- site, O2- is bonded to four equivalent Ba2+ and two Cu+2.33+ atoms to form a mixture of distorted edge and corner-sharing OBa4Cu2 octahedra. The corner-sharing octahedra tilt angles range from 0–11°.

36 MATERIALS SCIENCE↗