NMR study of hydrogen diffusion in zirconium hydride
The nuclear-magnetic-resonance method was used to study the diffusion of hydrogen in zirconium hydride by measuring the temperature dependence of T/sub 1/ in a temperature range where the major relaxation mechanism was due to hydrogen diffusion. The samples investigated were ZrH/sub 1.588/, ZrH/sub 1.629/, ZrH/sub 1.684/, ZrH/sub 1.736/, ZrH/sub 1.815/, ZrH/sub 1.910/, and ZrH/sub 1.960/. These spanned both the cubic and tetragonal phases. The activation energy was found to be independent of hydrogen concentration in the cubic phase with E/sub a/ = 13.4 +- 0.4 kcal/mol and a preexponential factor given by A = (1/2)(2-x)(45 +- 10) x 10/sup 12/ Hz. In the tetragonal phase the activation energy of the bulk of the hydrogen increased modestly with concentration. In addition, it was discovered that a new very fast hydrogen channel was created by the tetragonality for approx.3% of the hydrogen. They jump with a preexponential factor that is about 2 orders of magnitude larger than that of the rest of the hydrogen. A comparison was also made between the Bloembergen-Purcell-Pound, the Barton-Sholl, and the Bustard theories for nuclear magnetic relaxation due to diffusion.
- Research Organization:
- Department of Physics, Ben-Gurion University of the Negev, 84120 Beer Sheva, Israel
- OSTI ID:
- 6460636
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 33:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN
DIFFUSION
ZIRCONIUM HYDRIDES
ATOM TRANSPORT
NUCLEAR MAGNETIC RESONANCE
SPIN-LATTICE RELAXATION
ACTIVATION ENERGY
CUBIC LATTICES
RELAXATION TIME
TEMPERATURE DEPENDENCE
TETRAGONAL LATTICES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
HYDRIDES
HYDROGEN COMPOUNDS
MAGNETIC RESONANCE
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
RADIATION TRANSPORT
RELAXATION
RESONANCE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties