Abstract
The hydrogen absorption, kinetics of hydrogen absorption and thermodynamics of dissolved hydrogen in C14 Laves phase alloy ZrMnFe 0.7Co 0.3 are studied in the ranges 1≤ P (bar)≤30 and 303≤ T (K)≤473. Substituting Co at Fe site in ZrMnFe leads to the contraction of the lattice and subsequently increases the plateau pressure with a reduction in hydrogen intake capacity. The relative partial molar enthalpy and entropy of dissolved hydrogen in ZrMnFe 0.7Co 0.3–H are found to be in the ranges −(6–11) kJ (mol H) −1 and −(20–42) J K −1 (mol H) −1, respectively. The presence of α, ( α+ β) and β phases as seen in the P-C isotherms, is further confirmed by thermodynamic studies and kinetics of hydrogen absorption.
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