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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Lu2GeO5 by Materials Project

Lu2GeO5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Lu3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Lu–O bond distances ranging from 2.13–2.51 Å. Ge4+ is bonded to six O2- atoms to form corner-sharing GeO6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are a spread of Ge–O bond distances ranging from 1.90–2.04 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Lu3+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Lu3+ and one Ge4+ atom. In the third O2- site, O2- is bonded to two equivalent Lu3+ and two equivalent Ge4+ atoms to form distorted corner-sharing OLu2Ge2 trigonal pyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu2Ge2O7 by Materials Project

Lu2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional. Lu3+ is bonded to seven O2- atoms to form distorted LuO7 pentagonal bipyramids that share corners with five equivalent GeO4 tetrahedra, edges with five equivalent LuO7 pentagonal bipyramids, and an edgeedge with one GeO4 tetrahedra. There are a spread of Lu–O bond distances ranging from 2.19–2.51 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with five equivalent LuO7 pentagonal bipyramids, a cornercorner with one GeO4 tetrahedra, and an edgeedge with one LuO7 pentagonal bipyramid. There are a spread of Ge–O bond distances ranging from 1.76–1.80 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Lu3+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to two equivalent Ge4+ atoms. In the third O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Lu3+ and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Lu3+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗