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In this section, results of the DSC analyses are presented. The results of the scaled<br />
up analyses which were done using the Parr reactor and the U-tube reactor are given in<br />
the subsequent sections. Experimentally determined aluminum content for all the samples<br />
are presented in this section.<br />
The theoretical mole percentages of Al in LaNi 5 Al x in DSC analyses were 0.87,<br />
5.26, 14.29 and 33.33 mole %. Percentages for samples used in Parr and U-tube reactors<br />
were 0.79, 1.56, 3.88 and 14.21 mole %. The actual percent Al values were determined<br />
after the samples had been ball milled and used for hydrogen uptake. Some of the<br />
samples were analyzed before they were reacted with hydrogen. The results for all<br />
samples, converted to mole % Al, are given in Table 2.<br />
Table 2. Aluminum content before and after ball milling.<br />
Mole % Al<br />
Sample Initial mixture After Milling<br />
1. Milled (SS), reacted, Parr 0.79 0.74<br />
2. Milled (WC), reacted, DSC 0.87 0.77<br />
3. Milled (SS), reacted, Parr 1.56 1.35<br />
4. Milled (SS), Parr 1.56 1.22<br />
5. Milled (SS), loose powder, Parr 3.88 3.38<br />
6. Milled (SS), residue in the vial, Parr 3.88 3.94<br />
7. Milled (WC), reacted, DSC 5.26 4.74<br />
8. Milled (SS), Parr 14.21 14.00<br />
9. Milled (WC), reacted, DSC 14.29 12.00<br />
10. Milled (WC), reacted, DSC 33.33 47.31<br />
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