Supported by the National Research Council of Canada as a part of the Electrochemical Sensors Project.
Thermodynamics of CuAlO2 and CuAl2O4 and Phase Equilibria in the System Cu2O-CuO-Al2O3
Article first published online: 2 JUN 2006
Journal of the American Ceramic Society
Volume 58, Issue 5-6, pages 192–195, May 1975
How to Cite
JACOB, K. T. and ALCOCK, C. B. (1975), Thermodynamics of CuAlO2 and CuAl2O4 and Phase Equilibria in the System Cu2O-CuO-Al2O3. Journal of the American Ceramic Society, 58: 192–195. doi: 10.1111/j.1151-2916.1975.tb11441.x
- Issue published online: 2 JUN 2006
- Article first published online: 2 JUN 2006
- Received October 24, 1974
The standard Gibbs free energies of formation of CuAlO2 and CuAl2O4 were determined in the range 700° to 1100°C, using emf measurements on the galvanic cells (1) Pt,CuO +] Cu2O/CaO-ZrO2/O2,Pt; (2) Pt,Cu +] CuAlO2+] Al2O3/CaO-ZrO2/ Cu +] Cu2O,Pt; and (3) Pt,CuAl2O4+] CuAlO2+]Al2O3/CaO-ZrO2/O2,Pt. The results are compared with published information on the stability of these compounds. The entropy of transformation of CuO from tenorite to the rock-salt structure is evaluated from the present results and from earlier studies on the entropy of formation of spinels from oxides of the rock-salt and corundum structures. The temperatures corresponding to 3-phase equilibria in the system Cu2O-CuO-Al2O3 at specified O2 pressures calculated from the present results are discussed in reference to available phase diagrams.