Alloy-oxide equilibria in the system Pt-Rh-O

K. T. Jacob, Shashank Priya, Yoshio Waseda

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The composition of Pt-Rh alloys that co-exist with Rh2O3 in air have been identified by experiment at 1273 K. The isothermal sections of the phase diagram for the ternary system Pt-Rh-O at 973 K and 1273 K have been computed based on experimentally determined phase relations and recent thermodynamic measurements on Pt1-XRhX alloys and Rh2O3. The composition dependence of the oxygen partial pressure for the oxidation of Pt1-XRhX alloys at different temperatures, and temperature for the oxidation of the alloys in air are computed. The diagrams provide quantitative information for optimization of the composition of Pt1-XRhX alloys for high temperature application in oxidizing atmospheres.

Original languageEnglish (US)
Pages (from-to)99-103
Number of pages5
JournalBulletin of Materials Science
Issue number1
StatePublished - 1998
Externally publishedYes


  • Oxidation
  • Phase diagram
  • Pt-Rh alloys
  • Stability field
  • System Pt-Rh-O
  • Thermodynamic properties


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