Abstract
The influence of hydrogen ordering processes on the temperature dependence of the proton spin-lattice relaxation time T1(T) in lanthanum hydrides is estimated. It is shown that on taking into account the dipole-dipole interaction of hydrogen and metal atoms, and the interaction of hydrogen atoms with conduction electrons, an excellent description of the experimental T1(T) dependence can be obtained. It is shown as well that spatial redistribution of ordering octa-hydrogen atoms induces a negligibly small changes in the calculated T1(T) dependence, as the major part of the dipole-dipole interaction is related with the unchanged totalities of tetra-hydrogens and metal atoms.
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References
Ratishvili I.G., Vajda P. “Hydrogen ordering in the superstoichiometric rare-earth dihydrides. The case of a system with an energy constanst ratio p = V2 /V1 <1. LaH2+x”. Phys.Rev. B (1996), 53, 581–587.
Ratishvili I.G., Vajda P. “Phase diagrams of RH2+x - systems (R = La, Ce, Tb). Results of mean-field calculations”. Journ. All. Comp. (1997), 253–254, 171–174.
Ratishvili I.G., Namoradze N.Z. “Influence of hydrogen ordering on the spinlattice relaxation time in metal hydrides I. The high-temperature limit”. Bull. Georg. Acad. Sciences. (2004), 169 (2), 279–281. “II. The low-temperature limit”. ibid, (2004), 169 (3), 481–483.
Phua T.-T. et al. “Paramagnetic impurity effects in NMR determinations of hydrogen diffusion and electronic structure in metal hydrides. Gd3+ in YH2 and LaH2.25”. Phys. Rev. B (1983), 28, 6227–6250.
Fukai Y, Kazama S. “NMR studies of anomalous diffusion of hydrogen and phase transition in vanadium-hydrogen alloys”. Acta Metall., (1977), 25, 59–70.
Mamniashvili G.I., Namoradze N.Z., Ratishvili I.G., Sharimanov Yu.G. “Proton Spin-Lattice Relaxation Time in Ordering VHx alloys”. J. Phys. Chem. Solids (2005), 66, 1192–1199.
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NAMORADZE, N., RATISHVILI, I. (2007). INFLUENCE OF HYDROGEN ORDERING ON THE PROTON SPIN-LATTICE RELAXATION TIME IN LANTHANUM SUPERSTOICHIOMETRIC DIHYDRIDES LaH2+c . In: Veziroglu, T.N., et al. Hydrogen Materials Science and Chemistry of Carbon Nanomaterials. NATO Security through Science Series A: Chemistry and Biology. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5514-0_9
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DOI: https://doi.org/10.1007/978-1-4020-5514-0_9
Publisher Name: Springer, Dordrecht
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