Hydrogen diffusion in C15-type HfMo2H0.4: nuclear magnetic resonance evidence of two frequency scales of H hopping

Autor:	V. N. Kozhanov, A.P. Stepanov, Alexander V. Skripov, Alexei V. Soloninin
Rok vydání:	1999
Předmět:	Range (particle radiation) Nuclear magnetic resonance Hydrogen chemistry Proton Relaxation (NMR) Spin–lattice relaxation chemistry.chemical_element General Materials Science Atmospheric temperature range Diffusion (business) Condensed Matter Physics Jump process
Zdroj:	Journal of Physics: Condensed Matter. 11:10393-10400
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/11/50/329
Popis:	Nuclear magnetic resonance measurements of the proton spin-lattice relaxation rate in C15-type HfMo2H0.4 have been performed over the temperature range 20-420 K and the resonance frequency range 13-90 MHz. The temperature dependence of the relaxation rate is found to exhibit two peaks. This is consistent with a coexistence of two types of H hopping with different frequency scales. The experimental results are analysed to evaluate the parameters of hydrogen motion and the electronic (Korringa) contribution to the relaxation rate. Our results support the idea that the ratio of the characteristic frequencies of the two types of H motion in C15 compounds AB2 is related to the ratio of the metallic radii of elements A and B.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6f067bb35e4e6927d08e99f831c1d43a https://doi.org/10.1088/0953-8984/11/50/329 Zobrazit plný text záznamu