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The degradation of YBa2Cu3O7 resulting from exposure to wet and dry steam

Published online by Cambridge University Press:  31 January 2011

D.K. Pham ,
Zhao Ru-Peng ,
P.E. Fielding ,
S. Myhra  and
P.S. Turner
D.K. Pham
Affiliation:
Division of Science and Technology, Griffith University, Nathan, Queensland 4111, Australia
Zhao Ru-Peng
Affiliation:
Division of Science and Technology, Griffith University, Nathan, Queensland 4111, Australia
P.E. Fielding
Affiliation:
Department of Chemistry, University of New England, Armidale, New South Wales 2351, Australia
S. Myhra
Affiliation:
Division of Science and Technology, Griffith University, Nathan, Queensland 4111, Australia
P.S. Turner
Affiliation:
Division of Science and Technology, Griffith University, Nathan, Queensland 4111, Australia
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Abstract

The severity of degradation of YBa2Cu3O7−x from exposure to an aqueous phase has the following dependence: wet steam (condensed thin film) > bulk fluid phase > dry steam, other variables being constant. Also, the surface reactivity increases with oxygen deficiency. It is found that the early stages of degradation are associated with surface hydroxylation and preferential extraction of Ba. Subsequently, dissolution takes place, followed by solution saturation and sequential precipitation, nucleation, and growth of secondary phases. These observations form the basis of a model which incorporates surface hydroxylation and OH− penetration of the bulk, formation of planar defects and extraction of Ba, lattice dissolution, and mobility and solubility constraints.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 6 , June 1991 , pp. 1148 - 1155
Copyright
Copyright © Materials Research Society 1991

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