THE NUCLEAR MAGNETIC RESONANCE STUDY OF LANTHANUM HYDRIDE

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1962

OSTI ID:4713639

Schreiber, D S

The nuclear magnetic resonance of both the La and the H nuclei in lanthanum hydride has been studied as a function of H concentration and temperature. The concentrations ranged from 0.4 H/La to 2.85 H/La and temperatures, -197 un. Concent 85% C to 400 un. Concent 85% C. The existence of 2 phases, part La metal and part LaH/sub 2.0/ for concentrations with less than 2 H/La is confirmed. Measurements of the proton linewidth and thermal relaxation time, T/sub 1/, unambiguously demonstrate that proton self-diffusion takes place at moderate temperatures. Activation energies and attempt frequencies for the proton self-diffusion are determined as a function of H concentration. The self- diffusing protons have a pronounced effect (via a quadrupole interaction) on the La resonances. A detailed semiquantitative analysis incorporating the proton resonance data is made of these quadrupolar effects. The thermal relaxation time of the La resonance in LaH/sub 2.0/ is found to be the result of a conduction electron hyperfine interaction. A schematic picture of the band structure of the hydrides consistent with the available data is suggested, based on an ionized H atom or proton, whose electron goes into a conduction band localized in the La ion. (M.P.G.)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-022393
• OSTI ID: 4713639
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

DIFFUSION
DIFFUSION LENGTH
ELECTRONS
ENERGY
ENERGY LEVELS
FREQUENCY
HYDROGEN
HYPERFINE STRUCTURE
INTERACTIONS
IONIZATION
LANTHANUM
LANTHANUM HYDRIDES
LATTICES
MEASURED VALUES
NUCLEAR MAGNETIC RESONANCE
NUCLEAR MODELS
NUCLEI
PHYSICS
PROTONS
QUADRUPOLES
QUANTITY RATIO
RELAXATION
SLOWDOWN
TEMPERATURE