Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “B-Co-Hf”

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 HfCo3B2 by Materials Project

HfCo3B2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Hf is bonded in a 6-coordinate geometry to twelve equivalent Co and six equivalent B atoms. All Hf–Co bond lengths are 2.85 Å. All Hf–B bond lengths are 2.78 Å. Co is bonded in a distorted square co-planar geometry to four equivalent Hf and four equivalent B atoms. All Co–B bond lengths are 2.07 Å. B is bonded in a 9-coordinate geometry to three equivalent Hf and six equivalent Co atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfCo3B2 by Materials Project

HfCo3B2 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded to two equivalent Hf and twelve Co atoms to form distorted corner-sharing HfHf2Co12 cuboctahedra. Both Hf–Hf bond lengths are 2.99 Å. There are six shorter (2.73 Å) and six longer (2.85 Å) Hf–Co bond lengths. In the second Hf site, Hf is bonded in a 12-coordinate geometry to two Hf, twelve Co, and six equivalent B atoms. The Hf–Hf bond length is 3.09 Å. There are a spread of Hf–Co bond distances ranging from 2.73–3.01 Å. All Hf–B bond lengths are 2.62 Å. There are two inequivalent Co sites. In the first Co site, Co is bonded in a 4-coordinate geometry to four Hf and four equivalent B atoms. All Co–B bond lengths are 2.21 Å. In the second Co site, Co is bonded in a 4-coordinate geometry to four Hf and four equivalent B atoms. All Co–B bond lengths are 2.04 Å. B is bonded in a 9-coordinate geometry to two equivalent Hf, six Co, and one B atom. The B–B bond length is 2.04 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2(Co7B2)3 by Materials Project

Co21Hf2B6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Hf is bonded in a distorted tetrahedral geometry to four equivalent Co atoms. All Hf–Co bond lengths are 2.48 Å. There are three inequivalent Co sites. In the first Co site, Co is bonded in a cuboctahedral geometry to twelve equivalent Co atoms. All Co–Co bond lengths are 2.52 Å. In the second Co site, Co is bonded to one Hf and three equivalent B atoms to form a mixture of edge and corner-sharing CoHfB3 tetrahedra. All Co–B bond lengths are 2.07 Å. In the third Co site, Co is bonded in a distorted bent 150 degrees geometry to one Co and two equivalent B atoms. Both Co–B bond lengths are 2.10 Å. B is bonded in a 8-coordinate geometry to eight Co atoms.

36 MATERIALS SCIENCE↗