Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Ge-O-Tm”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Tm2Ge2O7 by Materials Project

Tm2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional. Tm3+ is bonded to seven O2- atoms to form distorted TmO7 pentagonal bipyramids that share corners with five equivalent GeO4 tetrahedra, edges with five equivalent TmO7 pentagonal bipyramids, and an edgeedge with one GeO4 tetrahedra. There are a spread of Tm–O bond distances ranging from 2.21–2.53 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with five equivalent TmO7 pentagonal bipyramids, a cornercorner with one GeO4 tetrahedra, and an edgeedge with one TmO7 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 distorted bent 150 degrees geometry to two equivalent Ge4+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Tm3+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a trigonal planar geometry to two equivalent Tm3+ and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Tm3+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2GeO5 by Materials Project

Tm2GeO5 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded in a 1-coordinate geometry to four O2- atoms. There are a spread of Tm–O bond distances ranging from 1.79–2.29 Å. In the second Tm3+ site, Tm3+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Tm–O bond distances ranging from 1.57–2.28 Å. In the third Tm3+ site, Tm3+ is bonded in a 4-coordinate geometry to four O2- atoms. There are a spread of Tm–O bond distances ranging from 1.56–2.27 Å. In the fourth Tm3+ site, Tm3+ is bonded in a 1-coordinate geometry to four O2- atoms. There are a spread of Tm–O bond distances ranging from 1.79–2.28 Å. There are two inequivalent Ge4+ sites. In the first Ge4+ site, Ge4+ is bonded in a 2-coordinate geometry to four O2- atoms. There are a spread of Ge–O bond distances ranging from 1.62–2.09 Å. In the second Ge4+ site, Ge4+ is bonded in a distorted rectangular see-saw-like geometry to four O2- atoms. There are a spread of Ge–O bond distances ranging from 1.23–1.94 Å. There are ten inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two Tm3+ and one Ge4+ atom. In the second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Tm3+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Tm3+ and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two Tm3+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to two Tm3+ and one Ge4+ atom. In the sixth O2- site, O2- is bonded in a bent 120 degrees geometry to one Tm3+ and one Ge4+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Tm3+ and one Ge4+ atom. In the eighth O2- site, O2- is bonded in an L-shaped geometry to two Tm3+ atoms. In the ninth O2- site, O2- is bonded in a 1-coordinate geometry to two Tm3+ and one Ge4+ atom. In the tenth O2- site, O2- is bonded in an L-shaped geometry to two Tm3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2GeO5 by Materials Project

Tm2GeO5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Tm–O bond distances ranging from 2.21–2.53 Å. In the second Tm3+ site, Tm3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Tm–O bond distances ranging from 2.24–2.40 Å. Ge4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Ge–O bond distances ranging from 1.73–1.82 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Tm3+ and one Ge4+ atom. In the second O2- site, O2- is bonded to four Tm3+ atoms to form OTm4 tetrahedra that share corners with five OTm4 tetrahedra and edges with three OTm3Ge tetrahedra. In the third O2- site, O2- is bonded to three Tm3+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing OTm3Ge tetrahedra. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Tm3+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Tm3+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2GeO5 by Materials Project

Tm2GeO5 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded to seven O2- atoms to form distorted TmO7 hexagonal pyramids that share corners with two equivalent TmO7 hexagonal pyramids, corners with three equivalent GeO5 trigonal bipyramids, edges with five TmO7 hexagonal pyramids, and edges with two equivalent GeO5 trigonal bipyramids. There are a spread of Tm–O bond distances ranging from 2.25–2.37 Å. In the second Tm3+ site, Tm3+ is bonded to seven O2- atoms to form distorted TmO7 hexagonal pyramids that share corners with two equivalent TmO7 hexagonal pyramids, a cornercorner with one GeO5 trigonal bipyramid, edges with seven TmO7 hexagonal pyramids, and edges with two equivalent GeO5 trigonal bipyramids. There are a spread of Tm–O bond distances ranging from 2.29–2.35 Å. Ge4+ is bonded to five O2- atoms to form distorted GeO5 trigonal bipyramids that share corners with four TmO7 hexagonal pyramids, corners with two equivalent GeO5 trigonal bipyramids, and edges with four TmO7 hexagonal pyramids. There are a spread of Ge–O bond distances ranging from 1.76–1.94 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to four Tm3+ atoms to form OTm4 tetrahedra that share corners with fourteen OTm4 tetrahedra and edges with four OTm3Ge tetrahedra. In the second O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Tm3+ and one Ge4+ atom. In the third O2- site, O2- is bonded to two Tm3+ and two equivalent Ge4+ atoms to form distorted OTm2Ge2 tetrahedra that share corners with six OTm4 tetrahedra and edges with five OTm3Ge tetrahedra. In the fourth O2- site, O2- is bonded to three Tm3+ and one Ge4+ atom to form OTm3Ge tetrahedra that share corners with nine OTm4 tetrahedra and edges with four OTm3Ge tetrahedra. In the fifth O2- site, O2- is bonded to three Tm3+ and one Ge4+ atom to form a mixture of distorted edge and corner-sharing OTm3Ge tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tm2GeO5 by Materials Project

Tm2GeO5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Tm3+ sites. In the first Tm3+ site, Tm3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Tm–O bond distances ranging from 2.17–2.64 Å. In the second Tm3+ site, Tm3+ is bonded to six O2- atoms to form distorted TmO6 octahedra that share corners with four equivalent GeO4 tetrahedra and edges with two equivalent TmO6 octahedra. There are a spread of Tm–O bond distances ranging from 2.18–2.30 Å. Ge4+ is bonded to four O2- atoms to form GeO4 tetrahedra that share corners with four equivalent TmO6 octahedra. The corner-sharing octahedra tilt angles range from 44–71°. There are a spread of Ge–O bond distances ranging from 1.76–1.80 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to four Tm3+ atoms to form distorted edge-sharing OTm4 tetrahedra. In the second O2- site, O2- is bonded in a trigonal non-coplanar geometry to two equivalent Tm3+ and one Ge4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Tm3+ and one Ge4+ atom. In the fourth O2- site, O2- is bonded in a 3-coordinate geometry to two Tm3+ and one Ge4+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Tm3+ and one Ge4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TmGeO3 by Materials Project

TmGeO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Tm3+ is bonded to twelve equivalent O2- atoms to form TmO12 cuboctahedra that share corners with twelve equivalent TmO12 cuboctahedra, faces with six equivalent TmO12 cuboctahedra, and faces with eight equivalent GeO6 octahedra. All Tm–O bond lengths are 2.75 Å. Ge3+ is bonded to six equivalent O2- atoms to form GeO6 octahedra that share corners with six equivalent GeO6 octahedra and faces with eight equivalent TmO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Ge–O bond lengths are 1.94 Å. O2- is bonded in a distorted linear geometry to four equivalent Tm3+ and two equivalent Ge3+ atoms.

36 MATERIALS SCIENCE↗