Jacob, K. T. ; 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 (5-6). pp. 192-195. ISSN 0002-7820
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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1151-...
Related URL: http://dx.doi.org/10.1111/j.1151-2916.1975.tb11441.x
Abstract
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Ceramic Society. |
| ID Code: | 12802 |
| Deposited On: | 11 Nov 2010 08:54 |
| Last Modified: | 03 Jun 2011 10:16 |
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