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|Title:||Nuclear spin relaxation and diffusion in the A15 compound Nb₃AlHx||Contributor(s):||Sholl, Colin (author)||Publication Date:||2007||DOI:||10.1088/0953-8984/19/40/406228||Handle Link:||https://hdl.handle.net/1959.11/6083||Abstract:||The theory of nuclear spin relaxation is developed for a random walk model of H diffusing between sites that form a non-Bravais lattice structure, including multiple rates of jumps between sites in a unit cell. The results are applied to H diffusing by first and second nearest neighbour jumps between interstitial d sites in the A15 compound Nb₃AlHx. The random walk model is exact for H–metal dipolar relaxation in the low H concentration limit and provides a good approximation at arbitrary concentrations when average site-blocking of jumps is included. This model can show the high temperature 1/√ω frequency dependence of the relaxation rates for one-dimensional diffusion possible in this structure for nearest neighbour jumps along the crystal axes. The low and high H concentration proton-relaxation data for Nb₃AlHx, as a function of temperature and resonance frequency, are fitted well at high temperatures using a simple set of H jump parameters. The theory provides a more rigorous approach and enables a more complete analysis than the simple Bloembergen–Purcell–Pound model used in previous work.||Publication Type:||Journal Article||Source of Publication:||Journal of Physics: Condensed Matter, 19(40), p. 1-8||Publisher:||Institute of Physics Publishing Ltd||Place of Publication:||Bristol, United Kingdom||ISSN:||1361-648X
|Field of Research (FOR):||020406 Surfaces and Structural Properties of Condensed Matter||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 63
|Appears in Collections:||Journal Article|
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