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BPR, 400 rpm, 5 minutes) did not result in any improvement in terminal hydrogen<br />
capacity [63]. As milling time was increased (60 to 600 minutes), H 2 capacity decreased<br />
for samples that were milled under both Ar and H 2 atmospheres. Samples milled in<br />
hydrogen showed a greater decrease in hydrogen capacity due to formation of elemental<br />
La and, consequently, its thermodynamically stable hydride LaH 2 . On the other hand, the<br />
kinetics for both systems were enhanced as the plateau region in the p-c-T diagram<br />
diminished (Figure 20) indicating the disappearance of the LaNi 5 hydride phase [63].<br />
Figure 20. Effect of milling time on pressure-composition isotherms of LaNi 5 under<br />
argon (left) and hydrogen (right) atmospheres.<br />
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