Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “O-Pr-Te”

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.

4 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Pr2TeO2 by Materials Project

Pr2TeO2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr3+ is bonded in a 4-coordinate geometry to four equivalent Te2- and four equivalent O2- atoms. All Pr–Te bond lengths are 3.58 Å. All Pr–O bond lengths are 2.37 Å. Te2- is bonded in a distorted body-centered cubic geometry to eight equivalent Pr3+ atoms. O2- is bonded to four equivalent Pr3+ atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr2Te2O7 by Materials Project

Pr2Te2O7 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Pr3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are two shorter (2.39 Å) and six longer (2.62 Å) Pr–O bond lengths. Te4+ is bonded to six equivalent O2- atoms to form corner-sharing TeO6 octahedra. The corner-sharing octahedral tilt angles are 55°. All Te–O bond lengths are 2.20 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Pr3+ and two equivalent Te4+ atoms to form a mixture of distorted edge and corner-sharing OPr2Te2 tetrahedra. In the second O2- site, O2- is bonded to four equivalent Pr3+ atoms to form OPr4 tetrahedra that share corners with sixteen OPr4 tetrahedra and edges with six equivalent OPr2Te2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr2Te4O11 by Materials Project

Pr2Te4O11 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Pr3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pr–O bond distances ranging from 2.41–2.70 Å. There are two inequivalent Te4+ sites. In the first Te4+ site, Te4+ is bonded in a distorted see-saw-like geometry to four O2- atoms. There are a spread of Te–O bond distances ranging from 1.86–2.43 Å. In the second Te4+ site, Te4+ is bonded in a 3-coordinate geometry to four O2- atoms. There are a spread of Te–O bond distances ranging from 1.90–2.72 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Pr3+ and one Te4+ atom. In the second O2- site, O2- is bonded in a 3-coordinate geometry to one Pr3+ and two Te4+ atoms. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Pr3+ and one Te4+ atom. In the fourth O2- site, O2- is bonded in a bent 150 degrees geometry to two equivalent Te4+ atoms. In the fifth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Pr3+ and one Te4+ atom. In the sixth O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Pr3+ and two Te4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr2TeO6 by Materials Project

Pr2TeO6 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. there are two inequivalent Pr3+ sites. In the first Pr3+ site, Pr3+ is bonded to seven O2- atoms to form distorted PrO7 hexagonal pyramids that share corners with three equivalent TeO6 octahedra, edges with two equivalent PrO7 hexagonal pyramids, and edges with two equivalent TeO6 octahedra. The corner-sharing octahedra tilt angles range from 36–44°. There are a spread of Pr–O bond distances ranging from 2.41–2.58 Å. In the second Pr3+ site, Pr3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Pr–O bond distances ranging from 2.36–2.72 Å. Te6+ is bonded to six O2- atoms to form TeO6 octahedra that share corners with three equivalent PrO7 hexagonal pyramids and edges with two equivalent PrO7 hexagonal pyramids. There are a spread of Te–O bond distances ranging from 1.93–1.99 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Pr3+ and one Te6+ atom. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Pr3+ and one Te6+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Pr3+ and one Te6+ atom. In the fourth O2- site, O2- is bonded to three Pr3+ and one Te6+ atom to form distorted corner-sharing OPr3Te tetrahedra. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two Pr3+ and one Te6+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two Pr3+ and one Te6+ atom.

36 MATERIALS SCIENCE↗