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Factors controlling carbon retention in YBa2Cu3O7−δ

Published online by Cambridge University Press:  31 January 2011

Evelyne Cazy ,
Ali Khalfi ,
David S. Smith  and
Jean Pierre Bonnet
Evelyne Cazy
Affiliation:
Laboratoire de Matériaux Céramiques et Traitement de Surface, 47 avenue Albert Thomas, 87065 Limoges-cedex, France
Ali Khalfi
Affiliation:
Laboratoire de Matériaux Céramiques et Traitement de Surface, 47 avenue Albert Thomas, 87065 Limoges-cedex, France
David S. Smith
Affiliation:
Laboratoire de Matériaux Céramiques et Traitement de Surface, 47 avenue Albert Thomas, 87065 Limoges-cedex, France
Jean Pierre Bonnet
Affiliation:
Laboratoire de Matériaux Céramiques et Traitement de Surface, 47 avenue Albert Thomas, 87065 Limoges-cedex, France
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Abstract

Natural degradation of YBa2Cu3O7−δ powders leads to trapping of CO2 by the powder. The presence of residual carbon in ceramics or textured materials can strongly affect the superconducting properties. Optimal conditions for carbon elimination during thermal treatment are defined. Amounts of carbon lower than 500 ppm are easily obtained when thermal treatment is performed in temperature, gas flowing rate, and heating ramp conditions allowing CO2 departure before pore closure. Liquid phase formation and the presence of BaCuO2 are limiting factors. An oxycarbonate formed by reaction between this latter compound and evolved CO2 is implied in the last step of the decarbonation process.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 6 , June 1997 , pp. 1451 - 1455
Copyright
Copyright © Materials Research Society 1997

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