日本金属学会誌

J. Japan Inst. Metals, Vol. 64, No. 3 (2000),
pp. 184-189

Coarsening of Y211 Phase Particles in the Y--Ba--Cu--O Superconducting System

Junya Maeda1, Sukeharu Nomoto2, Satoshi Matsuoka1,, Teruo Izumi1, Takateru Umeda3 and Yuh Shiohara1

1Superconductivity Research Laboratory, ISTEC, Tokyo 135--0062
2Ishikawajima System Technology CO. LTD., Tokyo 135--0016

3Department of Metallurgy, Graduate School of Engineering, The University of Tokyo, Tokyo 113--8656

Abstract:

It is important to understand the coarsening behavior of the Y2BaCuO5 phase particles in Ba--Cu--O melts, since the particle--size distribution of the Y2BaCuO5 particles entrapped in the YBa2Cu3Ox superconducting phase largely affect the superconducting properties. In this paper, we have investigated the dependence of the volume fractions of the high--temperature stable phase Y2BaCuO5 particles in the Ba--Cu--O melt on the coarsening behavior. Consequently, it was found that the coarsening rate constants between the volume fraction of Vf=10--15% and Vf=20--30% were significantly different. Furthermore, the particle--size--distributions for the Vf=20 and 30%, were investigated and discussed.


(Received November 5, 1999; In Final Form January 14, 2000)

Keywords:

superconductor, YBCO, coarsening, Y211 phase


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