Year 2005, Month 1 (Section Full Articles, Page 135)
Specific features of the thermodynamics of activation
in the LaNi5—H2 and CeNi5—H2 systems
N. A. Yakovleva,* S. N. Klyamkin, O. A. Veremeeva, and A. A. Tsikhotskaya
Using heat conducting Tian—Calvet calorimetry and volumetric measurements, the first
hydrogen absorption—desorption cycles in the LaNi5—H2 and CeNi5—H2 systems were studied. The pressure—composition isotherms were plotted, the equilibrium pressures of hydrogen
along the absorption and desorption branches and in the region of hysteresis for different
activation steps were determined, and the enthalpies of phase transitions α → β and β → α were
calculated. The profiles of the heat evolution curves were analyzed. It was concluded that the
mechanism of the reactions studied changes upon activation.
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