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Exchange model for proton relaxation in disordered metallic hydrides

✍ Scribed by V.I. Chizhik; V.S. Kasperovich; M.G. Shelyapina; Yu. S. Chernyshev

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
306 KB
Volume
36
Category
Article
ISSN
0360-3199

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✦ Synopsis

The experimental frequency and temperature dependences of proton spin-lattice relaxation in metallic hydrides are often treated within the Bloembergen-Purcell-Pound model. However, even the consideration of activation energy (or correlation time) distribution does not provide a satisfactory agreement with experimental data. It was experimentally detected that in metallic hydrides hydrogen atoms can be in two states: mobile and bounded to the lattice. Here, we suggest treating the proton spin-lattice relaxation in such systems within the model, which implies an exchange between these two states. The correlation times and activation energies values for the hydrogen motion in a hydride of the disordered TiV 0.8 Cr 1.2 alloy have been estimated applying this exchange model.

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