Abstract
It has been shown that both CO and SO 2 gases have the effect of sealing the LaNi 5-hydride surface and therefore confining hydrogen. The sealed hydride is then stable in air at atmospheric pressure. We describe here the behaviour of CO treated LaNi 5 and LaNi 5Zr 0.1 hydride powders with average particle size and temperature dependence of the sealing effect. The effect of an additional SO 2 treatment to the CO-treated hydride is also demonstrated. The samples are studied by means of XRD, SEM, EPMA, XPS and PAC methods.
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