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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ho2Cu(GeO3)4 by Materials Project

Ho2Cu(GeO3)4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ho3+ is bonded to seven O2- atoms to form distorted HoO7 pentagonal bipyramids that share corners with six GeO4 tetrahedra, edges with two equivalent HoO7 pentagonal bipyramids, and an edgeedge with one GeO4 tetrahedra. There are a spread of Ho–O bond distances ranging from 2.24–2.57 Å. Cu2+ is bonded in a square co-planar geometry to four O2- atoms. All Cu–O bond lengths are 1.98 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with four equivalent HoO7 pentagonal bipyramids and corners with two equivalent GeO4 tetrahedra. There are a spread of Ge–O bond distances ranging from 1.76–1.80 Å. In the second Ge4+ site, Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with two equivalent HoO7 pentagonal bipyramids, corners with two equivalent GeO4 tetrahedra, and an edgeedge with one HoO7 pentagonal bipyramid. There are a spread of Ge–O bond distances ranging from 1.75–1.82 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ho3+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ho3+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a 3-coordinate geometry to one Ho3+ and two Ge4+ atoms. In the fourth O2- site, O2- is bonded in a bent 120 degrees geometry to two Ge4+ atoms. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ho3+, one Cu2+, and one Ge4+ atom. In the sixth O2- site, O2- is bonded in a distorted trigonal planar geometry to one Ho3+, one Cu2+, and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Cu(GeO4)2 by Materials Project

Ho2Cu(GeO4)2 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two 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 2.24–2.81 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 2.26–2.73 Å. Cu2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Cu–O bond distances ranging from 1.91–2.66 Å. There are three inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded in a tetrahedral geometry to four O2- atoms. All Ge–O bond lengths are 1.79 Å. In the second Ge4+ site, Ge4+ is bonded to five O2- atoms to form corner-sharing GeO5 trigonal bipyramids. There are a spread of Ge–O bond distances ranging from 1.78–1.96 Å. In the third Ge4+ site, Ge4+ is bonded to four O2- atoms to form corner-sharing GeO4 tetrahedra. There is two shorter (1.77 Å) and two longer (1.80 Å) Ge–O bond length. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ho3+ and one Ge4+ atom. In the second O2- site, O2- is bonded to two Ho3+, one Cu2+, and one Ge4+ atom to form a mixture of distorted corner and edge-sharing OHo2CuGe trigonal pyramids. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two Ho3+, two equivalent Cu2+, and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Ho3+, one Cu2+, and one Ge4+ atom. In the fifth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ho3+ and one Ge4+ atom. In the sixth O2- site, O2- is bonded to two Ho3+, one Cu2+, and one Ge4+ atom to form a mixture of distorted corner and edge-sharing OHo2CuGe trigonal pyramids. In the seventh O2- site, O2- is bonded in a 2-coordinate geometry to two Ho3+ and two Ge4+ atoms. In the eighth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ho3+ and one Ge4+ atom. In the ninth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Ho3+ and one Ge4+ atom. In the tenth O2- site, O2- is bonded to two Ho3+, one Cu2+, and one Ge4+ atom to form a mixture of distorted corner and edge-sharing OHo2CuGe trigonal pyramids.

36 MATERIALS SCIENCE↗