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Compatible phases of the Y2O3–CuO–Cu2O system in air

Published online by Cambridge University Press:  08 February 2011

Ahmed M. Gadalla  and
Paisan Kongkachuichay
Ahmed M. Gadalla*
Affiliation:
Chemical Engineering Department, Texas A&M University, College Station, Texas 77843
Paisan Kongkachuichay
Affiliation:
Chemical Engineering Department, Texas A&M University, College Station, Texas 77843
*
a)Address correspondence to this author.
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Abstract

The phase diagram of the Y2O3–CuO–Cu2O system was constructed as a function of temperature in air by means of thermal analysis and x-ray diffraction. The phase Y2Cu2O5 was found to be stoichiometric and melted peritectically at about 1110 °C. A new intermediate phase with the composition YCu2O2.5 was discovered. It exists between 990 and 1105 °C in air and quenching did not preserve it to room temperature. High temperature x-ray diffraction established its pattern and confirmed its peritectic decomposition. Above 1110 °C YCu2O2.5 consists of Y2O3 and liquid. The results of this system are shown on a ternary system as well as on a pseudo-binary phase diagram. The solid state reactions were established. Melting occurs with isothermal oxygen loss or gain, depending on the initial composition.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 3 , March 1991 , pp. 450 - 454
Copyright
Copyright © Materials Research Society 1991

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