SEARCH · Search NASA

Results for “Eu-O-Re”

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.

SourceResearch connectionFrom yearThrough year

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

4 records

All sources NASA NTRS DOE OSTI

DOE OSTI2020

Materials Data on Eu2ReO5 by Materials Project

Eu2ReO5 crystallizes in the tetragonal P4/n space group. The structure is three-dimensional. Eu3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Eu–O bond distances ranging from 2.32–2.70 Å. There are two inequivalent Re4+ sites. In the first Re4+ site, Re4+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Re–O bond lengths are 1.90 Å. In the second Re4+ site, Re4+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Re–O bond lengths are 1.89 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded to four equivalent Eu3+ atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O2- site, O2- is bonded to four equivalent Eu3+ atoms to form OEu4 tetrahedra that share corners with twelve equivalent OEu3Re tetrahedra and edges with two equivalent OEu4 tetrahedra. In the third O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Eu3+ and one Re4+ atom. In the fourth O2- site, O2- is bonded to three equivalent Eu3+ and one Re4+ atom to form a mixture of distorted corner and edge-sharing OEu3Re tetrahedra.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Eu3ReO7 by Materials Project

Eu3ReO7 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Eu3+ sites. In the first Eu3+ site, Eu3+ is bonded to six O2- atoms to form distorted EuO6 octahedra that share corners with two equivalent EuO6 octahedra, corners with four equivalent ReO6 octahedra, and edges with two equivalent EuO6 octahedra. The corner-sharing octahedra tilt angles range from 46–67°. There are a spread of Eu–O bond distances ranging from 2.30–2.46 Å. In the second Eu3+ site, Eu3+ is bonded in a body-centered cubic geometry to eight O2- atoms. There are four shorter (2.42 Å) and four longer (2.81 Å) Eu–O bond lengths. Re5+ is bonded to six O2- atoms to form ReO6 octahedra that share corners with two equivalent ReO6 octahedra and corners with eight equivalent EuO6 octahedra. The corner-sharing octahedra tilt angles range from 14–65°. All Re–O bond lengths are 1.92 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded to four Eu3+ atoms to form a mixture of corner and edge-sharing OEu4 tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three Eu3+ and one Re5+ atom. In the third O2- site, O2- is bonded in a linear geometry to two equivalent Re5+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Eu(ReO4)2 by Materials Project

Eu(ReO4)2 crystallizes in the trigonal P-3 space group. The structure is two-dimensional and consists of one Eu(ReO4)2 sheet oriented in the (0, 0, 1) direction. Eu2+ is bonded to six equivalent O2- atoms to form EuO6 octahedra that share corners with six equivalent ReO4 tetrahedra. All Eu–O bond lengths are 2.48 Å. Re7+ is bonded to four O2- atoms to form ReO4 tetrahedra that share corners with three equivalent EuO6 octahedra. The corner-sharing octahedral tilt angles are 20°. There is one shorter (1.73 Å) and three longer (1.76 Å) Re–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted bent 150 degrees geometry to one Eu2+ and one Re7+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on EuReO3 by Materials Project

EuReO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu3+ is bonded to twelve equivalent O2- atoms to form EuO12 cuboctahedra that share corners with twelve equivalent EuO12 cuboctahedra, faces with six equivalent EuO12 cuboctahedra, and faces with eight equivalent ReO6 octahedra. All Eu–O bond lengths are 2.83 Å. Re3+ is bonded to six equivalent O2- atoms to form ReO6 octahedra that share corners with six equivalent ReO6 octahedra and faces with eight equivalent EuO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Re–O bond lengths are 2.00 Å. O2- is bonded in a distorted linear geometry to four equivalent Eu3+ and two equivalent Re3+ atoms.

36 MATERIALS SCIENCE↗