발간논문

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Vol.27, No.9, 836 ~ 840, 1989
Title
Temperature Dependence of the Chemical Hysteresis in the LaNi5 - H System
민동준Dong Joon Min, 박충년Choong Nyeon Park
Abstract
A chemical hysteresis and its temperature dependence in the LaNi_5-H system have been investigated by using a Sievert-type apparatus. The initial hydrogenation rate was controlled by the valve opening and the initial hydrogen pressure of a hydrogen gas reservoir. The pressure-composition isothermss in LaNi_5-H measured at 10, 30, and 50℃ varied sensitively with the hydrogenation rate and the temperature, implying an existence of a chemical hysteresis and its temperature dependence in this alloy. The chemical hysteresis decreased with increasing the temperature. By an annealing treatment of the activated LaNi_5 the temperature dependence of the chemical hysteresis decreased remarkably.
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