SEARCH · Engineering Papers
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.
Be2B is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Be is bonded to four equivalent B atoms to form a mixture of corner and edge-sharing BeB4 tetrahedra. All Be–B bond lengths are 1.98 Å. B is bonded in a body-centered cubic geometry to eight equivalent Be atoms.
Be4B crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. there are three inequivalent Be sites. In the first Be site, Be is bonded to four equivalent B atoms to form a mixture of distorted edge and corner-sharing BeB4 tetrahedra. All Be–B bond lengths are 2.05 Å. In the second Be site, Be is bonded in a 9-coordinate geometry to twelve Be and one B atom. There are a spread of Be–Be bond distances ranging from 2.08–2.38 Å. The Be–B bond length is 2.19 Å. In the third Be site, Be is bonded in a distorted bent 120 degrees geometry to four equivalent Be and two equivalent B atoms. Both Be–B bond lengths are 1.92 Å. B is bonded in a 8-coordinate geometry to nine Be atoms.
BeB2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Be is bonded to twelve equivalent B atoms to form a mixture of face and edge-sharing BeB12 cuboctahedra. All Be–B bond lengths are 2.22 Å. B is bonded in a 9-coordinate geometry to six equivalent Be and three equivalent B atoms. All B–B bond lengths are 1.69 Å.