Search NASA⌕ Search

SEARCH · Search NASA

Results for “Al-Cr-Gd”

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.

3 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Gd(Al2Cr)4 by Materials Project

Gd(CrAl2)4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Gd is bonded in a 12-coordinate geometry to eight equivalent Cr and twelve Al atoms. All Gd–Cr bond lengths are 3.41 Å. There are four shorter (3.03 Å) and eight longer (3.21 Å) Gd–Al bond lengths. Cr is bonded to two equivalent Gd, two equivalent Cr, and eight Al atoms to form distorted CrGd2Al8Cr2 cuboctahedra that share corners with eight equivalent AlGd2Al6Cr4 cuboctahedra, corners with ten equivalent CrGd2Al8Cr2 cuboctahedra, edges with four equivalent CrGd2Al8Cr2 cuboctahedra, edges with four equivalent AlGd2Al6Cr4 cuboctahedra, faces with six equivalent CrGd2Al8Cr2 cuboctahedra, and faces with eight equivalent AlGd2Al6Cr4 cuboctahedra. Both Cr–Cr bond lengths are 2.52 Å. There are four shorter (2.58 Å) and four longer (2.69 Å) Cr–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded to two equivalent Gd, four equivalent Cr, and six Al atoms to form distorted AlGd2Al6Cr4 cuboctahedra that share corners with eight equivalent CrGd2Al8Cr2 cuboctahedra, corners with ten equivalent AlGd2Al6Cr4 cuboctahedra, edges with three equivalent AlGd2Al6Cr4 cuboctahedra, edges with four equivalent CrGd2Al8Cr2 cuboctahedra, faces with seven equivalent AlGd2Al6Cr4 cuboctahedra, and faces with eight equivalent CrGd2Al8Cr2 cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.73–2.88 Å. In the second Al site, Al is bonded in a 10-coordinate geometry to one Gd, four equivalent Cr, and five Al atoms. The Al–Al bond length is 2.90 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd(Al10Cr)2 by Materials Project

GdCr2Al20 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Gd is bonded in a 4-coordinate geometry to sixteen Al atoms. There are four shorter (3.13 Å) and twelve longer (3.21 Å) Gd–Al bond lengths. Cr is bonded to twelve Al atoms to form CrAl12 cuboctahedra that share corners with six equivalent CrAl12 cuboctahedra, edges with eighteen equivalent AlGdAl10Cr cuboctahedra, and faces with six equivalent AlGdAl10Cr cuboctahedra. There are six shorter (2.56 Å) and six longer (2.78 Å) Cr–Al bond lengths. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 12-coordinate geometry to two equivalent Cr and ten Al atoms. There are a spread of Al–Al bond distances ranging from 2.71–2.82 Å. In the second Al site, Al is bonded to one Gd, one Cr, and ten Al atoms to form distorted AlGdAl10Cr cuboctahedra that share corners with fifteen equivalent AlGdAl10Cr cuboctahedra, edges with two equivalent AlGdAl10Cr cuboctahedra, edges with three equivalent CrAl12 cuboctahedra, a faceface with one CrAl12 cuboctahedra, and faces with fifteen equivalent AlGdAl10Cr cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.72–3.10 Å. In the third Al site, Al is bonded in a distorted linear geometry to two equivalent Gd and twelve equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd(AlCr)6 by Materials Project

Gd(CrAl)6 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Gd is bonded in a 8-coordinate geometry to twelve Cr and eight Al atoms. There are four shorter (3.37 Å) and eight longer (3.40 Å) Gd–Cr bond lengths. There are a spread of Gd–Al bond distances ranging from 3.00–3.11 Å. There are two inequivalent Cr sites. In the first Cr site, Cr is bonded to two equivalent Gd, four Cr, and six Al atoms to form a mixture of distorted edge, face, and corner-sharing CrGd2Al6Cr4 cuboctahedra. There are two shorter (2.56 Å) and two longer (2.58 Å) Cr–Cr bond lengths. There are a spread of Cr–Al bond distances ranging from 2.63–2.72 Å. In the second Cr site, Cr is bonded to two equivalent Gd, four equivalent Cr, and six Al atoms to form a mixture of distorted edge, face, and corner-sharing CrGd2Al6Cr4 cuboctahedra. There are a spread of Cr–Al bond distances ranging from 2.68–2.78 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 10-coordinate geometry to one Gd, six Cr, and three Al atoms. There are one shorter (2.72 Å) and two longer (2.89 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 7-coordinate geometry to one Gd, six Cr, and two equivalent Al atoms. Both Al–Al bond lengths are 3.06 Å. In the third Al site, Al is bonded in a 12-coordinate geometry to two equivalent Gd, six Cr, and four Al atoms.

36 MATERIALS SCIENCE↗