| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1272327 | International Journal of Hydrogen Energy | 2011 | 5 Pages |
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 TiV0.8Cr1.2 alloy have been estimated applying this exchange model.
Research highlights► Temperature dependence of proton T1 provides information on hydrogen mobility. ► BPP model fails to explain several features of this dependence in metallic hydrides. ► In metallic hydrides hydrogen atoms can be in mobile and bounded states. ► We suggest treating the proton T1 in such systems within an exchange model. ► This model implies an exchange between two hydrogen states: mobile and bounded.
