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Effect of silver addition on the microstructure of YBa2Cu3O7−x

Published online by Cambridge University Press:  03 March 2011

Jondo Yun ,
Martin P. Harmer  and
Ye T. Chou
Jondo Yun
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015-3195
Martin P. Harmer
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015-3195
Ye T. Chou
Affiliation:
Department of Materials Science and Engineering and Materials Research Center, Lehigh University, Bethlehem, Pennsylvania 18015-3195
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Abstract

The variation of grain morphology in silver-doped YBa2Cu3O7−x was investigated as a function of sintering temperature, atmosphere, and amount of Ag addition. In the presence of the liquid phase formed at 925 °C for undoped samples, and at 910 °C for silver-doped samples, the grain shape and size changed drastically from small and nearly equiaxed to large and elongated. The anisotropy in the grain shape was sensitive to both the silver content and the atmosphere. On the other hand, while the grain size was generally insensitive to the atmosphere, it decreased as the silver content increased. The silver phase, if sufficiently large, would block the grain growth in the matrix. The amount of silver for effective blocking was predicted from a microstructural model, and the prediction was in agreement with experimental results.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 6 , June 1994 , pp. 1342 - 1349
Copyright
Copyright © Materials Research Society 1994

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