Crystal structures of some lanthanide hydrides

Journal Article · Mon Jan 01 00:00:00 EST 1962 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100807a033· OSTI ID:4802671

Pebler, A.; Wallace, W. E.

Hydrides of Pr, Nd, Sm, Tb, Dy, Ho, Er, Tm, Lu, and Y were formed and examined using x-ray diffraction techniques. The dihydrides of the several metals always were observed to be cubic. Appreciable contraction of the lattice occurs when PrH₂, NdH₂ or SmH₂ absorbs extra hydrogen The PrH₂ and NdH₂ phases remain cubic to the highest hydrogen concentration attainable, whereas the Sm --H system undergoes a transformation such that the Sm ion cores are in a cph arrangement for hydrogen concentrations exceeding that corresponding to the formula SmH_2.59. Similar transformations are observed for the several heavy lanthanides studied and for yttrium, the range of stabillty of the dihydride being, however, considerably less than that for the alloys based on SmH₂. The dependence of the lattice spacing on composition is discussed in terms of the presumed electronic nature of the lanthanide hydrides. The observed contraction of the dihydride lattice is consistent with the notion (suggested by their electrical and magnetic behavior) that the lanthanide hydrides are essentially saline in nature and the hydride ion is formed by absorption of electrons from the conduction band of the metal.

• Research Organization: Univ. of Pittsburgh
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-007567
• OSTI ID: 4802671
• Journal Information: Journal of Physical Chemistry, Vol. 66, Issue 1; Other Information: Orig. Receipt Date: 31-DEC-62; ISSN 0022-3654
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION
CONFIGURATION
CRYSTALS
DIFFRACTION
DYSPROSIUM HYDRIDES
ELECTRIC CONDUCTIVITY
ELECTRONS
ERBIUM HYDRIDES
HOLMIUM HYDRIDES
HYDROGEN
LATTICES
LUTETIUM HYDRIDES
NEODYMIUM HYDRIDES
PRASEODYMIUM HYDRIDES
QUALITATIVE ANALYSIS
SAMARIUM HYDRIDES
STABILITY
TERBIUM HYDRIDES
THULIUM HYDRIDES
X RADIATION
YTTRIUM HYDRIDES