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The hydrogen-absorbing intermetallic compound LaNi5 was activated using volumetric apparatus (a HTP1-V volumetric hydrogen storage analyser) at 333 K. Pressure-composition isotherms (PCIs) were measured through the first 8 hydrogenation cycles and show considerable change in the hydrogen absorption behaviour through the activation process. A series of isotherms at temperatures in the range 308 – 413 K were also measured. The higher temperature measurements show a clear indication of the formation of an intermediate phase between the solid solution phase and hydride phase. Van ‘t Hoff plots were determined from the measured isotherms and the average value for ΔH of 15.6 kJ/mol ½H2 was found to be in good agreement with the literature.
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