Hydrogen absorption studies in ZrMnFe0.7Co0.3

The hydrogen absorption, kinetics of hydrogen absorption and thermodynamics of dissolved hydrogen in C14 Laves phase alloy ZrMnFe0.7Co0.3 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 ZrMnFe0.7Co0.3–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.