Thermodynamic Modeling of Equilibrium Subsolidus Phase Relations in the Ag-Pd-O₂ System
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.
Recommended Citation
S. Wang and W. Huebner, "Thermodynamic Modeling of Equilibrium Subsolidus Phase Relations in the Ag-Pd-O₂ System," Journal of the American Ceramic Society, Wiley-Blackwell, Jun 1991.
The definitive version is available at https://doi.org/10.1111/j.1151-2916.1991.tb04110.x
Department(s)
Materials Science and Engineering
Keywords and Phrases
Palladium; Silver; Models; Thermodynamics; Reduction-Oxidation
International Standard Serial Number (ISSN)
0002-7820; 1551-2916
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1991 Wiley-Blackwell, All rights reserved.
Publication Date
01 Jun 1991
