Abstract
Hydrogen absorption studies have been carried out on the C15 cubic Laves phase alloy of Zr 0.2Ho 0.8Fe 0.5Co 1.5. The p– c data were collected in the pressure and temperature ranges of 0.05 ≤ P (bar) ≤ 45 and 27 ≤ T (°C) ≤ 100, respectively. A maximum hydrogen uptake of 3.6 hydrogen atoms per formula unit at 33 bar and 27°C is observed. The p– c isotherms show one plateau (α + β) region. This is confirmed from the dependence of the thermodynamics of dissolved hydrogen as a function of hydrogen concentration. Δ H H and Δ S H are found to be in the ranges −(5–15) kJ (mol H) −1 and −(23–48) J K −1 (mol H) −1, respectively. Volume expansion of about 20% is found at the maximum hydrogen concentration at RT, without a change in its crystal structure.
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