Abstract
Zr 0.7Ti 0.3Mn 2Fe 0.8 hydride was prepared and studied as a function of temperature (25–200 °C) and hydrogen equilibrium pressure (0.01–50 atm). The vapor pressure of the quaternary hydride system is approximately 1000 times larger than that of the ZrMn 2-H 2 system. The hydrogen density of the alloy relative to liquid hydrogen is 0.7. The enthalpy and entropy of hydrogénation are very low, being −14.1 kJ mol -1 and−59.5 J mol -1 K -1 respectively. The low value of ΔH α → β and the rapid kinetics of hydrogen absorption-desorption processes are particularly significant in regard to practical applications of Zr 1− x Ti x Mn 2Fe y alloys for hydrogen storage.
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