Thermodynamics of CuAlO2 and CuAl2O4 and Phase Equilibria in the System Cu2O‐CuO‐Al2O3
- 1 May 1975
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 58 (5-6) , 192-195
- https://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.Keywords
This publication has 18 references indexed in Scilit:
- Thermodynamics of formation of simple spinelsJournal of Inorganic and Nuclear Chemistry, 1968
- Thermodynamic Properties of the Oxides of Fe, Ni, Pb, Cu, and Mn, by EMF MeasurementsJournal of the Electrochemical Society, 1968
- Free Energy of Formation of Cupric OxideJournal of the Electrochemical Society, 1967
- The System Copper Oxide—AluminaJournal of the American Ceramic Society, 1963
- A Study of Basic Brick from Copper Anode FurnacesJournal of the American Ceramic Society, 1961
- Entropy of Hausmannite to Spinel TransformationProceedings of the Physical Society, 1958
- Electronic properties of transition-metal oxides—IJournal of Physics and Chemistry of Solids, 1957
- Sur quelques composés du typeM2O3–Cu2OActa Crystallographica, 1956
- Untersuchungen über ternäre Chalkogenide. VII. Versuche zur Darstellung Ternärer Oxyde des Aluminiums, Galliums und Indiums mit einwertigem Kupfer und SilberZeitschrift für anorganische und allgemeine Chemie, 1955
- Schmelzdiagramme höchstfeuerfester Oxyde. IV. (Aluminiumoxyd)Zeitschrift für anorganische und allgemeine Chemie, 1932