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Control of Y2BaCuO5 size and morphology in melt-processed YBa2Cu3O7−δ superconductor

Published online by Cambridge University Press:  03 March 2011

N. Sakai ,
S.I. Yoo  and
M. Murakami
N. Sakai
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 16-25 Shibaura 1-Chome, Minato-ku, Tokyo 105, Japan
S.I. Yoo
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 16-25 Shibaura 1-Chome, Minato-ku, Tokyo 105, Japan
M. Murakami
Affiliation:
Superconductivity Research Laboratory, International Superconductivity Technology Center, 16-25 Shibaura 1-Chome, Minato-ku, Tokyo 105, Japan
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Abstract

Important factors governing the size and the morphology of Y2BaCuO5 (Y211) at 1100 °C in air were investigated for three different starting materials having the same nominal composition of Y:Ba:Cu = 1.8:2.4 : 3.4, Y2BaCuO5-BaCuO2-CuO-Pt. Y2O3-BaCuO2-CuO-Pt, and melt-quenched materials from 1400 °C in a Pt crucible. With various amounts of Pt doping, the heating rate and the holding time were employed as the processing parameters. While, with the aid of Pt doping as the effective growth inhibitor, fine round Y211 grains could be obtained by simply employing a refined round Y211 precursor and a rapid healing, there were several important factors for obtaining fine acicular (or needle-like) Y211 grains as follows: (i) The Pt dopants dissolved in the liquid phase should act as the effective heterogeneous nucleation sites. (ii) Y211 grains should grow into the acicular shapes before the system reaches an equilibrium amount of Y211 in the liquid (i.e., reaction-controlled). (iii) A large amount of the liquid phase should be supplied instantly at the partial melt stage with a rapid heating.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 7 , July 1995 , pp. 1611 - 1621
Copyright
Copyright © Materials Research Society 1995

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References

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