Abstract
The interaction of hydrogen with intermetalic compounds LaNi4.75Al0.25 and LaNi4.8Sn0.2 has been studied in the temperature range 308–353 K by the calorimetry titration method. The mechanism of hydrogenation was investigated. It was shown that, as the temperature increases, the initial concentration of hydrogen in the metal lattice needed for β-hydride formation decreases. It was assumed that this effect is related to the concentration of Hδ+ atoms, which “oxidize” the metallic matrix according to the scheme Hδ++M0→Hδ−+M+. The enthalpy and entropy of hydrogenation for the LaNi4.75Al0.25−H2 system were calculated from thep-C-T curves and the calorimetry results. The thermodynamic parameters of the LaNi4.8Sn0.2−H2 system were obtained for the first time.
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