Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “YB4”

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 YB4 by Materials Project

YB4 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Y is bonded in a 4-coordinate geometry to eighteen B atoms. There are a spread of Y–B bond distances ranging from 2.73–3.07 Å. There are three inequivalent B sites. In the first B site, B is bonded in a 1-coordinate geometry to four equivalent Y and five B atoms. There is one shorter (1.64 Å) and four longer (1.75 Å) B–B bond length. In the second B site, B is bonded in a 9-coordinate geometry to four equivalent Y and five B atoms. There is one shorter (1.72 Å) and two longer (1.81 Å) B–B bond length. In the third B site, B is bonded in a distorted trigonal planar geometry to six equivalent Y and three B atoms. The B–B bond length is 1.75 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y2FeB by Materials Project

Y2FeB crystallizes in the cubic F-43m space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded to four equivalent Fe and six equivalent B atoms to form distorted YFe4B6 tetrahedra that share corners with eighteen YB4 tetrahedra and faces with sixteen YFe4B6 tetrahedra. All Y–Fe bond lengths are 2.79 Å. All Y–B bond lengths are 3.23 Å. In the second Y site, Y is bonded to four equivalent B atoms to form distorted YB4 tetrahedra that share corners with twenty-four YB4 tetrahedra and faces with four equivalent YFe4B6 tetrahedra. All Y–B bond lengths are 2.79 Å. Fe is bonded in a distorted body-centered cubic geometry to four equivalent Y and four equivalent B atoms. All Fe–B bond lengths are 2.79 Å. B is bonded in a 8-coordinate geometry to ten Y and four equivalent Fe atoms.

36 MATERIALS SCIENCE↗