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3 rd run<br />
Intensity (arb. units)<br />
2 nd run<br />
1 st run<br />
20 30 40 50 60 70 80<br />
2-Theta (deg.)<br />
Figure 38. XRD spectra of LaNi 5 ground with mortar and pestle.<br />
Five more LaNi 5 samples were prepared by ball milling in the Spex8000M for<br />
3, 6, 10, 15 and 30 minutes respectively. The XRD spectra of the samples are given in<br />
Figure 39. As the reference, the XRD spectrum of non-milled LaNi 5 that most closely<br />
matches the expected spectrum is included. The relative intensities of the peaks were<br />
observed to approach the reported ratios for LaNi 5 as milling duration was increased.<br />
This suggests that the normal phase of LaNi 5 , a CaCu 5 phase was formed as the milling<br />
proceeded. In contrast, the peaks were observed to lose intensity and broaden, which<br />
suggested the formation of an amorphous phase, but, the broadening effect could be<br />
because of particle size reduction.<br />
78
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