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Effects of the Heating Rate on Conversion of the Precursor Powders Used for Melt Processes into YBa2Cu3O7−y

Published online by Cambridge University Press:  31 January 2011

Chan-Joong Kim ,
Ki-Baik Kim ,
Young A. Jee ,
Il-Hyun Kuk  and
Gye-Won Hong
Chan-Joong Kim
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusong, Taejon, 305-600, Korea
Ki-Baik Kim
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusong, Taejon, 305-600, Korea
Young A. Jee
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusong, Taejon, 305-600, Korea
Il-Hyun Kuk
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusong, Taejon, 305-600, Korea
Gye-Won Hong
Affiliation:
Superconductivity Research Laboratory, Korea Atomic Energy Research Institute, P.O. Box 105, Yusong, Taejon, 305-600, Korea
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Abstract

Effects of the heating rate (100−6000 °C/h) to a peritectic temperature (Tp – 1015 °C) on conversion of Y2O3−BaCuO2−CuO and Y2BaCuO5−BaCuO2−CuO precursor powders into YBa2Cu3O7−y (Y123) were studied. Both precursor powders were rapidly converted into the Y123 phase. A volume fraction of the Y123 phase was more than 50%, even at a relatively fast heating rate of 3000 °C/h. At about 100−200 °C/h, which correspond to the rates of the first heating cycles of practical melt processes, almost 100% of the precursor powders were converted into a Y123 phase. Microstructures were studied in respect to Y2BaCuO5 (Y211) particle size, distribution, gas evolution, and nucleation mechanism of Y211 particles.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1212 - 1220
Copyright
Copyright © Materials Research Society 1999

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