Thermodynamic Assessment of the Silver–Oxygen System |
| |
| Authors: | Jérôme Assal Bengt Hallstedt Ludwig J Gauckler |
| |
| Affiliation: | Department of Nonmetallic Materials, Swiss Federal Institute of Technology, CH-8092 Zürich, Switzerland |
| |
| Abstract: | An assessment of the silver–oxygen system has been made, and a consistent set of thermodynamic parameters has been optimized. The calculated thermodynamic properties and phase relations are in good agreement with the experimental data. Ag2O is the only phase that is commonly found within the system. In air, it decomposes to silver and oxygen gas at 420 K. There is a eutectic between silver and Ag2O at a temperature of 804 K, an oxygen partial pressure ( P O2) of 526 bar (5.26 × 107 Pa), and an oxygen mole fraction in the liquid phase of 0.25. Uncertainties remain on the Ag2O liquidus for P O2 > 108 Pa. An ionic two-sublattice model has been used to describe the liquid phase. This work is part of a study of interactions between compounds from the bismuth-strontium-calcium-copper-oxygen system and silver. |
| |
| Keywords: | |
|
|
