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Melt processing of Ba2CuO3: Textured precursor for the fabrication of HgBa2CuOy superconductor

Published online by Cambridge University Press:  31 January 2011

E. Sudhakar Reddy ,
T. Murakami ,
Y. Nakayama ,
J. Shimoyama  and
K. Kishio
E. Sudhakar Reddy*
Affiliation:
Department of Superconductivity, The University of Tokyo, Hongo, Tokyo 113–8656, Japan
T. Murakami
Affiliation:
Department of Superconductivity, The University of Tokyo, Hongo, Tokyo 113–8656, Japan
Y. Nakayama
Affiliation:
Department of Superconductivity, The University of Tokyo, Hongo, Tokyo 113–8656, Japan
J. Shimoyama
Affiliation:
Department of Superconductivity, The University of Tokyo, Hongo, Tokyo 113–8656, Japan
K. Kishio
Affiliation:
Department of Superconductivity, The University of Tokyo, Hongo, Tokyo 113–8656, Japan
*
e-mial: esreddy@access.rwth-aachen.de
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Abstract

A process for the fabrication of textured Ba2CuO3 material with a microstructure similar to that of melt-processed YBa2Cu3Oy (Y123) superconductor is discussed. The Ba2CuO3 samples were melt processed with the intent to use them as textured precursors for processing of HgBa2CuOy superconductor. The microstructure formation of the Ba2CuO3 phase was studied by observing the samples being quenched from intermediate stages of a melt growth schedule. The microstructure of melt-processed Ba2CuO3 reveals randomly oriented large-sized grains, similar to that of melt textured Y123. Other important microstructural features observed were finely distributed properitectic BaO particles, the absence of the platelet gaps within the domains, and the presence of a different kind of twin structure. The conversion of melt textured Ba2CuO3 into superconducting HgBa2CuOy phase by a two-step process is discussed.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 6 , June 2001 , pp. 1759 - 1768
Copyright
Copyright © Materials Research Society 2001

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