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The mole % Al after milling was less than that was originally loaded except for<br />
samples 6 and 10. Sample 6 was the material that was stuck on the milling media. The<br />
stuck material was recovered by milling the remaining powder in the presence of ethanol<br />
and then filtering the metal-ethanol suspension and drying. Al was the more malleable<br />
component, therefore, during milling it coated the milling media and depleted in the bulk.<br />
The increase of Al content in sample 10 may be because of the non-homogeneity of the<br />
milled product, therefore, the sample taken for analysis may not have been representative<br />
of the whole.<br />
Weight percent of H absorbed by LaNi 5 +Al samples are listed in Table 3 and the<br />
H 2 uptake curves for the samples containing different amounts of Al are given in Figure<br />
23. The closeness of percent hydrogen for smaller percent Al was due to the poor<br />
reproducibility of this heterogeneous reaction.<br />
Table 3: Percent hydrogen uptake values for different amounts of Al in LaNi 5 .<br />
Mole % Al<br />
Wt. % H 0 0.77 4.74 12.00 47.31<br />
Avg. (n=3) 1.04 1.05 0.95 0.87 0.68<br />
Max. observed 1.09 1.13 0.98 0.92 0.69<br />
57
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