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4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ho5(ReO6)2 by Materials Project

Ho5(ReO6)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are three inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ho–O bond distances ranging from 2.27–2.49 Å. In the second Ho3+ site, Ho3+ is bonded to six O2- atoms to form HoO6 octahedra that share corners with four equivalent ReO6 octahedra, corners with four equivalent HoO7 pentagonal bipyramids, and edges with two equivalent HoO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. There are two shorter (2.20 Å) and four longer (2.31 Å) Ho–O bond lengths. In the third Ho3+ site, Ho3+ is bonded to seven O2- atoms to form distorted HoO7 pentagonal bipyramids that share corners with two equivalent HoO6 octahedra, an edgeedge with one HoO6 octahedra, edges with two equivalent ReO6 octahedra, and edges with two equivalent HoO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 56°. There are a spread of Ho–O bond distances ranging from 2.27–2.42 Å. Re+4.50+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with two equivalent HoO6 octahedra, edges with two equivalent ReO6 octahedra, and edges with two equivalent HoO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. There are a spread of Re–O bond distances ranging from 1.97–2.10 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to two Ho3+ and two equivalent Re+4.50+ atoms to form distorted OHo2Re2 trigonal pyramids that share corners with eight OHo3Re tetrahedra, edges with four equivalent OHo3Re tetrahedra, and an edgeedge with one OHo2Re2 trigonal pyramid. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Ho3+ and two equivalent Re+4.50+ atoms. In the third O2- site, O2- is bonded to three Ho3+ and one Re+4.50+ atom to form distorted OHo3Re tetrahedra that share corners with ten OHo3Re tetrahedra, a cornercorner with one OHo2Re2 trigonal pyramid, edges with three OHo3Re tetrahedra, and edges with two equivalent OHo2Re2 trigonal pyramids. In the fourth O2- site, O2- is bonded to four Ho3+ atoms to form OHo4 tetrahedra that share corners with ten OHo3Re tetrahedra, corners with three equivalent OHo2Re2 trigonal pyramids, and edges with four OHo3Re tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3ReO7 by Materials Project

Ho3ReO7 crystallizes in the orthorhombic C222_1 space group. The structure is three-dimensional. there are two inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ho–O bond distances ranging from 2.31–2.36 Å. In the second Ho3+ site, Ho3+ is bonded to seven O2- atoms to form distorted HoO7 pentagonal bipyramids that share corners with two equivalent ReO6 octahedra, a cornercorner with one HoO7 pentagonal bipyramid, edges with two equivalent ReO6 octahedra, and edges with three equivalent HoO7 pentagonal bipyramids. The corner-sharing octahedra tilt angles range from 41–49°. There are a spread of Ho–O bond distances ranging from 2.21–2.42 Å. Re5+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with two equivalent ReO6 octahedra, corners with four equivalent HoO7 pentagonal bipyramids, and edges with four equivalent HoO7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 45°. There are a spread of Re–O bond distances ranging from 1.93–2.02 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Ho3+ and one Re5+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Ho3+ and two equivalent Re5+ atoms. In the third O2- site, O2- is bonded to four Ho3+ atoms to form OHo4 tetrahedra that share corners with ten OHo4 tetrahedra and edges with three OHo3Re tetrahedra. In the fourth O2- site, O2- is bonded to three Ho3+ and one Re5+ atom to form a mixture of distorted edge and corner-sharing OHo3Re tetrahedra. In the fifth O2- site, O2- is bonded to four Ho3+ atoms to form a mixture of edge and corner-sharing OHo4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho6ReO12 by Materials Project

Ho6ReO12 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Ho3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Ho–O bond distances ranging from 2.20–2.68 Å. Re6+ is bonded in an octahedral geometry to six equivalent O2- atoms. All Re–O bond lengths are 1.96 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Ho3+ and one Re6+ atom. In the second O2- site, O2- is bonded to four equivalent Ho3+ atoms to form a mixture of edge and corner-sharing OHo4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3ReO8 by Materials Project

Ho3ReO8 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are three inequivalent Ho3+ sites. In the first Ho3+ site, Ho3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ho–O bond distances ranging from 2.19–2.56 Å. In the second Ho3+ site, Ho3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ho–O bond distances ranging from 2.31–2.57 Å. In the third Ho3+ site, Ho3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Ho–O bond distances ranging from 2.22–2.61 Å. Re7+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of Re–O bond distances ranging from 1.82–1.99 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two Ho3+ and one Re7+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Ho3+ and one Re7+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Ho3+ and one Re7+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to three Ho3+ and one Re7+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three Ho3+ and one Re7+ atom. In the sixth O2- site, O2- is bonded to four Ho3+ atoms to form a mixture of distorted edge and corner-sharing OHo4 tetrahedra. In the seventh O2- site, O2- is bonded to four Ho3+ atoms to form a mixture of distorted edge and corner-sharing OHo4 trigonal pyramids. In the eighth O2- site, O2- is bonded in a 4-coordinate geometry to three Ho3+ and one Re7+ atom.

36 MATERIALS SCIENCE↗