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Mechanical alloying (MA) was used to synthesize LaNi 5 -type hydrogen storage materials. XRD analysis showed that, after 30 h milling, the starting mixture of the elements was decomposed into an amorphous phase. Following the annealing in high purity argon at 700 o C for 0.5 h, XRD confirmed the formation of the CaCu 5 -type structures with crystallite sizes of about 25 nm...
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