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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.

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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on PmWO3 by Materials Project

PmWO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Pm3+ is bonded to twelve equivalent O2- atoms to form PmO12 cuboctahedra that share corners with twelve equivalent PmO12 cuboctahedra, faces with six equivalent PmO12 cuboctahedra, and faces with eight equivalent WO6 octahedra. All Pm–O bond lengths are 2.92 Å. W3+ is bonded to six equivalent O2- atoms to form WO6 octahedra that share corners with six equivalent WO6 octahedra and faces with eight equivalent PmO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All W–O bond lengths are 2.06 Å. O2- is bonded to four equivalent Pm3+ and two equivalent W3+ atoms to form a mixture of distorted edge, face, and corner-sharing OPm4W2 octahedra. The corner-sharing octahedra tilt angles range from 0–60°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pm2(WO4)3 by Materials Project

Pm2(WO4)3 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Pm3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Pm–O bond distances ranging from 2.39–2.51 Å. There are two inequivalent W6+ sites. In the first W6+ site, W6+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of W–O bond distances ranging from 1.78–2.16 Å. In the second W6+ site, W6+ is bonded in a tetrahedral geometry to four O2- atoms. There is two shorter (1.80 Å) and two longer (1.85 Å) W–O bond length. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Pm3+ and two equivalent W6+ atoms. In the second O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Pm3+ and one W6+ atom. In the third O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Pm3+ and one W6+ atom. In the fourth O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Pm3+ and one W6+ atom. In the fifth O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Pm3+ and one W6+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Pm3+ and one W6+ atom.

36 MATERIALS SCIENCE↗