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Article
Thermodynamic Modeling of Equilibrium Subsolidus Phase Relations in the Ag-Pd-O₂ System
Journal of the American Ceramic Society
  • Sea-Fue Wang
  • Wayne Huebner, Missouri University of Science and Technology
Abstract

From literature values of the thermodynamic activity of Pd in Ag/Pd solid solutions and the Gibbs free energy of formation of PdO as a function of temperature, subsolidus equilibrium phase relations in the Pd-Ag-O2 system have been calculated and compared to results from high-temperature XRD analyses. the developed model takes into account the nonideal activity of Pd in Ag/Pd solid solutions and confirms that increasing the Ag/Pd ratio or decreasing the oxygen activity decreases the temperature at which PdO reduces. It also accurately predicts that the temperature range over which the PdO reduces is broad for Ag-rich compositions, and narrow for Pd-rich compositions.

Department(s)
Materials Science and Engineering
Keywords and Phrases
  • Palladium,
  • Silver,
  • Models,
  • Thermodynamics,
  • Reduction-Oxidation
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1991 Wiley-Blackwell, All rights reserved.
Publication Date
6-1-1991
Citation Information
Sea-Fue Wang and Wayne Huebner. "Thermodynamic Modeling of Equilibrium Subsolidus Phase Relations in the Ag-Pd-O₂ System" Journal of the American Ceramic Society (1991)
Available at: http://works.bepress.com/wayne-huebner/3/