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Influence of oxygen partial pressure on the kinetics of YBa2Cu3O7−x formation

Published online by Cambridge University Press:  03 March 2011

V. Milonopoulou ,
K.M. Forster ,
J.P. Formica ,
J. Kulik ,
J.T. Richardson  and
D. Luss
V. Milonopoulou
Affiliation:
Department of Chemical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
K.M. Forster
Affiliation:
Department of Chemical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
J.P. Formica
Affiliation:
Department of Chemical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
J. Kulik
Affiliation:
Department of Chemical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
J.T. Richardson
Affiliation:
Department of Chemical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
D. Luss*
Affiliation:
Department of Chemical Engineering and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204-4792
*
b)Author to whom correspondence should be addressed.
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Abstract

The YBa2Cu3O7−x formation kinetics from a spray-roasted precursor powder containing Y2O3, BaCO3, and CuO was followed via in situ, time-resolved x-ray diffraction as a function of gas atmosphere and temperature. In inert atmospheres, BaCO3 and CuO form BaCu2O2 which subsequently reacts with Y2O3 to form YBa2Cu3O6. However, YBa2Cu3O6 decomposes at temperatures exceeding 725 °C with Y2BaCuO5 being one of the decomposition products. In oxidizing atmospheres, YBa2Cu3O7−x formation involves the BaCuO2. At high temperatures (800–840 °C), oxygen increases the yield of YBa2Cu3O6. A nuclei growth model assuming two-dimensional, diffusion-controlled growth with second-order nucleation rate fits the experimental data.

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Articles
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Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 275 - 285
Copyright
Copyright © Materials Research Society 1994

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