Abstract
The phase formation sequence and the composition of phases induced by thermal annealing in a platinum (Pt) coated molybdenum (Mo) system were investigated by X-ray diffraction (XRD), Rutherford backscattering spectrometry (RBS) and transmission electron microscopy (TEM). The X-ray diffraction study of a 0.2μm thick platinum layer deposited on a Mo substrate and annealed at temperatures between 800°C and 900°C for different periods of time shows the formation of MoPt2 and MoPt phases. It was also found that these phases nucleate sequentially and the MoPt2 phase becomes unstable at 900°C after a longer annealing time of 8h. Rutherford backscattering spectroscopy and transmission electron microscopy showed that the coating thickness approximately doubled after thermal annealing, from 0.22μm to 0.46μm, due to the formation of the Pt–Mo phases.
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