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100 rpm setting, the milling vial was filled with 20 balls and 8.01 grams of sample. After<br />
milling, it was observed that the sample still contained the coarse particles. After thermal<br />
activation in the DSC, the sample did not absorb hydrogen in the subsequent constant<br />
temperature hydriding. Then, the milling speed was changed to 300 rpm for the next<br />
sample. After the activation cycle, 0.60% H was absorbed by the alloy, corresponding to<br />
LaNi 5 H 2.6 (Figure 19). The use of higher milling speed resulted in activation of the<br />
sample. Even though the reaction reached equilibrium within the first 500 seconds,<br />
similar to the sample prepared using the Spex8000 Mixer Mill, hydrogen capacity was<br />
lower. The reason for this difference in hydrogen capacity was possibly due to the<br />
different milling speeds which were 1725 rpm in Spex8000 and 300 rpm in the Fritsch.<br />
At higher milling speeds, the impact on the particles were stronger and the stress induced<br />
was more pronounced.<br />
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