A MODIFIED METHOD FOR MEASURING PCT ISOTHERMS OF METAL HYDRIDES
I.A. Romanov, D.O. Dunikov, A.A. Eronin, A.N. Kazakov
Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
Keywords: hydrogen, Sieverts method, PCT isotherm, metal hydride
Abstract
This paper describes a modification of the Sieverts method for measuring hydrogen absorption and desorption isotherms (PCT isotherms) for a sample of an AB5-type intermetallic compound with the composition LaNi4.8Al0.2. The modification consists in performing measurements by stepwise changing the temperature of the working vessel containing the sample at a fixed hydrogen concentration, rather than by adding or removing discrete hydrogen portions at a constant temperature. Hydrogen absorption and desorption isotherms obtained by the classical and modified methods for the same sample are compared. The modified Sieverts method is shown to be more accurate than the classical version, due to the elimination of cumulative measurement error.
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