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.
HoPb3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ho is bonded to twelve equivalent Pb atoms to form a mixture of face and corner-sharing HoPb12 cuboctahedra. All Ho–Pb bond lengths are 3.46 Å. Pb is bonded in a distorted square co-planar geometry to four equivalent Ho atoms.
Ho5Pb3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 6-coordinate geometry to six equivalent Pb atoms. All Ho–Pb bond lengths are 3.23 Å. In the second Ho site, Ho is bonded in a 5-coordinate geometry to five equivalent Pb atoms. There are a spread of Ho–Pb bond distances ranging from 3.10–3.60 Å. Pb is bonded in a 9-coordinate geometry to nine Ho atoms.
Ho3Pb is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to eight Ho and four equivalent Pb atoms to form distorted HoHo8Pb4 cuboctahedra that share corners with twelve equivalent HoHo8Pb4 cuboctahedra, edges with eight equivalent HoHo8Pb4 cuboctahedra, edges with eight equivalent PbHo12 cuboctahedra, faces with four equivalent PbHo12 cuboctahedra, and faces with ten equivalent HoHo8Pb4 cuboctahedra. There are four shorter (3.32 Å) and four longer (3.52 Å) Ho–Ho bond lengths. All Ho–Pb bond lengths are 3.52 Å. In the second Ho site, Ho is bonded in a square co-planar geometry to eight equivalent Ho and four equivalent Pb atoms. All Ho–Pb bond lengths are 3.32 Å. Pb is bonded to twelve Ho atoms to form PbHo12 cuboctahedra that share corners with four equivalent PbHo12 cuboctahedra, edges with eight equivalent PbHo12 cuboctahedra, edges with sixteen equivalent HoHo8Pb4 cuboctahedra, faces with four equivalent PbHo12 cuboctahedra, and faces with eight equivalent HoHo8Pb4 cuboctahedra.