Abstract
ZrMn/sub 2/Fe/sub x/ reacts with hydrogen very readily to form very hydrogen-rich systems. Hydrogen densities relative to liquid hydrogen are in the range 0.7 to 1.2. The hydrogen is very labile. Hydrogen vapor pressure increases rapidly with increasing x. The vapor pressure is increased more than 100-fold for ZrMn/sub 2/Fe/sub 0/ /sub 8/-H/sub 2/ and more than 1000-fold for ZrMn/sub 2/Fe/sub 1/ /sub 2/-H/sub 2/ compared to the ZrMn/sub 2/-H/sub 2/ system. The enthalpy and entropy of hydrogenation are exceptionally low with values in the range of -6.2 to -12.0 kJ/mol and -37.7 to -52.8 J/(mol K), respectively. The kinetics of hydrogen absorption and desorption processes in the alloy are very rapid; the processes are nearly complete within 1 min. The small values of the heat effects associated with hydrogenation and the rapid kinetics are particularly significant in regard to practical applications of ZrMn/sub 2/Fe/sub x/ alloys for hydrogen storage.
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