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.
YbH2 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Yb2+ is bonded in a body-centered cubic geometry to eight equivalent H1- atoms. All Yb–H bond lengths are 2.34 Å. H1- is bonded to four equivalent Yb2+ atoms to form a mixture of edge and corner-sharing HYb4 tetrahedra.
YbH2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Yb2+ is bonded in a 9-coordinate geometry to nine H1- atoms. There are a spread of Yb–H bond distances ranging from 2.22–2.56 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to four equivalent Yb2+ atoms to form HYb4 tetrahedra that share corners with eight equivalent HYb5 square pyramids, corners with eight equivalent HYb4 tetrahedra, edges with six equivalent HYb5 square pyramids, and edges with two equivalent HYb4 tetrahedra. In the second H1- site, H1- is bonded to five equivalent Yb2+ atoms to form distorted HYb5 square pyramids that share corners with eight equivalent HYb5 square pyramids, corners with eight equivalent HYb4 tetrahedra, edges with six equivalent HYb5 square pyramids, and edges with six equivalent HYb4 tetrahedra.