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Mechanochemical effects on synthesis and pulverization of Ba2YCu3O7−y, superconductor and Ba2YCu3O7−y–Ag composite

Published online by Cambridge University Press:  31 January 2011

Masanobu Awano ,
Keiko Kani ,
Yasumasa Takao ,
Yoshitaka Kuwahara  and
Hiroyoshi Takagi
Masanobu Awano
Affiliation:
Government Industrial Research Institute, Nagoya, 1-1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Keiko Kani
Affiliation:
Government Industrial Research Institute, Nagoya, 1-1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Yasumasa Takao
Affiliation:
Government Industrial Research Institute, Nagoya, 1-1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Yoshitaka Kuwahara
Affiliation:
Government Industrial Research Institute, Nagoya, 1-1 Hirate-cho, Kita-ku, Nagoya 462, Japan
Hiroyoshi Takagi
Affiliation:
The Ceramic Industrial Institute of Saga Prefecture Government, 3100-5 Chubu-otu, Arita town, Saga Prefecture 844, Japan
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Abstract

Mechanochemical effects on the synthesis and pulverization process of the Ba2YCu3O7−y superconductor (abbreviated to BYCO) and BYCO–Ag composite were examined. Grinding of the precursor of BYCO promoted the homogeneous distribution of each element and subsequently the crystallinity of the precursors was decreased. The sintered body obtained by using the ground and calcined powder had complicated crystal phases consisting of the BYCO phase with secondary phases and resulted in the impairment of the superconducting transport current property. Grinding of crystallized BYCO powder decreased its grain size and crystallinity; the crystallinity was recovered by annealing. On the other hand, grinding contributed to the synthesis of the BYCO–Ag superconducting composite by minimizing the particle sizes and mixing of components. The BYCO–Ag composite so obtained displayed improvement of superconducting properties.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 12 , December 1992 , pp. 3185 - 3193
Copyright
Copyright © Materials Research Society 1992

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References

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