Abstract
The crystal structures and hydrogen absorption/desorption properties of the ZrMn 0.85− x Fe 1+ x alloys ( x = 0, 0.2, 0.4) were investigated systematically. The pressure–composition (PC) isotherms and absorption kinetics were measured at 273–333 K by the volumetric method. Besides the crystal structure, the plateau pressure and the hydrogen intake capacity, this article also discussed the absorption kinetics, the pulverization resistance and the thermodynamic properties. XRD patterns revealed that ZrMn 0.85Fe and ZrMn 0.65Fe 1.2 were formed as hexagonal C14 laves phase structure while ZrMn 0.45Fe 1.4 possessed cubic C15 laves phase structure. With the increase of Fe and decrease of Mn, the plateau pressure increased while the hydrogen intake capacity lowered and the hydrogen absorption kinetics degraded. On the other hand, the hysteresis alleviated, the pulverization resistance improved and the stability of the hydrides decreased. The decomposition pressure was increased to more than 160 times for ZrMn 0.85Fe and more than 2500 times for ZrMn 0.65Fe 1.2 compared with that of the ZrMn 2 alloy.
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