Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “Al-Mg-Ta”

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 Mg16TaAl12 by Materials Project

Mg16TaAl12 crystallizes in the cubic I-43m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five equivalent Al atoms. There are a spread of Mg–Mg bond distances ranging from 3.03–3.13 Å. There are a spread of Mg–Al bond distances ranging from 2.90–3.15 Å. In the second Mg site, Mg is bonded in a 10-coordinate geometry to three equivalent Mg, one Ta, and six equivalent Al atoms. The Mg–Ta bond length is 3.11 Å. All Mg–Al bond lengths are 3.05 Å. Ta is bonded in a 4-coordinate geometry to four equivalent Mg and twelve equivalent Al atoms. All Ta–Al bond lengths are 3.14 Å. Al is bonded in a 11-coordinate geometry to seven Mg, one Ta, and three equivalent Al atoms. There are one shorter (2.63 Å) and two longer (2.72 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg3(TaAl9)2 by Materials Project

Mg3(TaAl9)2 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to two equivalent Mg and twelve equivalent Al atoms. Both Mg–Mg bond lengths are 3.22 Å. All Mg–Al bond lengths are 3.17 Å. In the second Mg site, Mg is bonded in a 12-coordinate geometry to four equivalent Mg and twelve equivalent Al atoms. All Mg–Al bond lengths are 3.27 Å. Ta is bonded to twelve Al atoms to form TaAl12 cuboctahedra that share corners with six equivalent TaAl12 cuboctahedra, edges with eighteen equivalent AlMg3TaAl8 cuboctahedra, and faces with six equivalent AlMg3TaAl8 cuboctahedra. There are six shorter (2.64 Å) and six longer (2.89 Å) Ta–Al bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 2-coordinate geometry to two equivalent Ta and ten Al atoms. There are a spread of Al–Al bond distances ranging from 2.78–2.93 Å. In the second Al site, Al is bonded to three Mg, one Ta, and eight Al atoms to form AlMg3TaAl8 cuboctahedra that share corners with fifteen equivalent AlMg3TaAl8 cuboctahedra, edges with two equivalent AlMg3TaAl8 cuboctahedra, edges with three equivalent TaAl12 cuboctahedra, a faceface with one TaAl12 cuboctahedra, and faces with fifteen equivalent AlMg3TaAl8 cuboctahedra. There are a spread of Al–Al bond distances ranging from 2.78–3.02 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg16TaAl12 by Materials Project

Mg16TaAl12 is gamma-brass-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are five inequivalent Mg sites. In the first Mg site, Mg is bonded in a 1-coordinate geometry to three equivalent Mg, one Ta, and twelve Al atoms. All Mg–Mg bond lengths are 3.12 Å. The Mg–Ta bond length is 3.02 Å. There are a spread of Mg–Al bond distances ranging from 3.15–3.23 Å. In the second Mg site, Mg is bonded in a 10-coordinate geometry to four Mg and six Al atoms. There are two shorter (3.02 Å) and one longer (3.04 Å) Mg–Mg bond lengths. There are a spread of Mg–Al bond distances ranging from 3.08–3.12 Å. In the third Mg site, Mg is bonded in a 12-coordinate geometry to six Mg, one Ta, and five Al atoms. There are four shorter (3.12 Å) and two longer (3.17 Å) Mg–Mg bond lengths. The Mg–Ta bond length is 3.03 Å. There are a spread of Mg–Al bond distances ranging from 2.90–3.09 Å. In the fourth Mg site, Mg is bonded in a 3-coordinate geometry to seven Mg, one Ta, and five Al atoms. There are two shorter (3.11 Å) and two longer (3.13 Å) Mg–Mg bond lengths. The Mg–Ta bond length is 3.56 Å. There are a spread of Mg–Al bond distances ranging from 2.85–3.18 Å. In the fifth Mg site, Mg is bonded in a 12-coordinate geometry to seven Mg and five Al atoms. Both Mg–Mg bond lengths are 3.15 Å. There are a spread of Mg–Al bond distances ranging from 2.91–3.15 Å. Ta is bonded in a 10-coordinate geometry to seven Mg and six equivalent Al atoms. All Ta–Al bond lengths are 2.96 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 11-coordinate geometry to eight Mg and three Al atoms. There are one shorter (2.72 Å) and two longer (2.78 Å) Al–Al bond lengths. In the second Al site, Al is bonded in a 11-coordinate geometry to eight Mg and three Al atoms. Both Al–Al bond lengths are 2.73 Å. In the third Al site, Al is bonded in a distorted q6 geometry to seven Mg, one Ta, and three Al atoms. There are one shorter (2.63 Å) and one longer (2.67 Å) Al–Al bond lengths.

36 MATERIALS SCIENCE↗