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.
YbAu4 crystallizes in the tetragonal I4/m space group. The structure is three-dimensional. Yb2+ is bonded to twelve equivalent Au+0.50- atoms to form a mixture of edge and face-sharing YbAu12 cuboctahedra. There are eight shorter (3.02 Å) and four longer (3.03 Å) Yb–Au bond lengths. Au+0.50- is bonded in a 12-coordinate geometry to three equivalent Yb2+ atoms.
Yb2Au is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Yb sites. In the first Yb site, Yb is bonded to four equivalent Au atoms to form a mixture of distorted edge and corner-sharing YbAu4 tetrahedra. There are a spread of Yb–Au bond distances ranging from 2.99–3.11 Å. In the second Yb site, Yb is bonded in a 5-coordinate geometry to five equivalent Au atoms. There are a spread of Yb–Au bond distances ranging from 3.16–3.53 Å. Au is bonded in a 9-coordinate geometry to nine Yb atoms.