Abstract
J. D. Guo et al. [J. Appl. Phys. 80, 1623 (1996)] have studied the thermal stability of Ni on GaN and have deduced by x-ray diffraction measurements that new phases form at the interface between Ni and GaN. This determination, based solely on x-ray diffraction data, is ambiguous, as the peaks assigned to the Ga 4 Ni 3 and Ni–N phases can also be attributed to substrate related x-ray peaks.

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