Search NASA⌕ Search

SEARCH · Search NASA

Results for “B-Ni-U”

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.

2 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on U2(Ni7B2)3 by Materials Project

U2Ni21B6 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. U is bonded in a distorted tetrahedral geometry to four equivalent Ni atoms. All U–Ni bond lengths are 2.49 Å. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded in a distorted bent 150 degrees geometry to one Ni and two equivalent B atoms. The Ni–Ni bond length is 2.56 Å. Both Ni–B bond lengths are 2.07 Å. In the second Ni site, Ni is bonded to one U and three equivalent B atoms to form a mixture of distorted corner and edge-sharing NiUB3 tetrahedra. All Ni–B bond lengths are 2.14 Å. In the third Ni site, Ni is bonded in a cuboctahedral geometry to twelve equivalent Ni atoms. B is bonded in a 8-coordinate geometry to eight Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on UNiB4 by Materials Project

UNiB4 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent U4+ sites. In the first U4+ site, U4+ is bonded in a 12-coordinate geometry to sixteen B+1.50- atoms. There are twelve shorter (2.76 Å) and four longer (2.85 Å) U–B bond lengths. In the second U4+ site, U4+ is bonded in a 8-coordinate geometry to sixteen B+1.50- atoms. There are eight shorter (2.77 Å) and eight longer (2.83 Å) U–B bond lengths. Ni2+ is bonded in a 6-coordinate geometry to six B+1.50- atoms. There are two shorter (2.07 Å) and four longer (2.17 Å) Ni–B bond lengths. There are two inequivalent B+1.50- sites. In the first B+1.50- site, B+1.50- is bonded in a 9-coordinate geometry to four U4+, one Ni2+, and four B+1.50- atoms. There are a spread of B–B bond distances ranging from 1.65–1.76 Å. In the second B+1.50- site, B+1.50- is bonded in a 1-coordinate geometry to four U4+, two equivalent Ni2+, and three B+1.50- atoms. The B–B bond length is 1.66 Å.

36 MATERIALS SCIENCE↗