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Chong et al. J Mater Inf 2023;3:21 https://dx.doi.org/10.20517/jmi.2023.17 Page 13 of 18
Figure 12. Cross-sectional morphologies and distribution of elements from EPMA EPMA mapping images Pt Al Hf after 100 h
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oxidation in air at 1,300 °C. (A) Cross-sectional morphology; (B1)-(B4) Pt, Al, O, and Hf map distribution, respectively; (C) Linear
distribution of Pt, Al, O, and Hf. EPMA: Electron probe micro-analyzer.
Figure 13. Surface XRD results of the alloy Pt Al Ta after oxidation at 1,300 °C for 100 h. XRD: X-ray diffraction.
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Thermodynamic calculations show that only Al O and HfO can form [Figure 3] due to insolubility of Hf in
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Al O in the present database and the very high P to form PtO ; c.f., Figure 2.
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