Title

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.

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.


Share

 
COinS