You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
After milling the percentages of Al were determined to be 4.74, 12.00 and 47.31<br />
mole %. The XRD spectra of the milled samples are plotted, Figure 42. The intensity of<br />
the Al Bragg peak at 38.5º increased with the increased Al content; however, its intensity<br />
was less than the Bragg peak of LaNi 5 . The angle of the Bragg peaks also changed from<br />
42.5º to 42.0º. This suggests the formation of LaNi 4 Al for which the angle of the Bragg<br />
peak is at 42.0º.<br />
This formation would lead to free Ni through<br />
LaNi 5 + Al → LaNi 4 Al + Ni<br />
The Bragg peak for Ni was expected to be at 45.5º, coinciding with one of the lines of<br />
LaNi 5 ; therefore, the formation Ni could not be verified. However, for LaNi 4 Al, a<br />
reflection line expected at 44.5º became observable for LaNi 5 milled with Al, which also<br />
suggests the formation of LaNi 4 Al by ball milling. The peak at 44.5º is indicated with a<br />
red arrow in the figure.<br />
81
Change language