Thermodynamics and phase equilibria in the system Cu2O CuO ()Ga2O3

Jacob, KT and Alcock, CB (1976) Thermodynamics and phase equilibria in the system Cu2O CuO ()Ga2O3. In: Rev. Int. Hautes. Temper. Refract, 13 . pp. 37-42.

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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:	Journal Article
Additional Information:	Copyright of this article belongs to John Wiley & Sons.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	05 Dec 2011 06:48
Last Modified:	05 Dec 2011 06:48
URI:	http://eprints.iisc.ernet.in/id/eprint/42481

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