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Liquidus relations in Y–Ba–Cu oxides

Published online by Cambridge University Press:  31 January 2011

Terry Aselage  and
Keith Keefer
Terry Aselage
Affiliation:
Electronic Ceramics Division 1842 and Ceramics Development Division 1845, Sandia National Laboratories, Albuquerque, New Mexico 87185
Keith Keefer
Affiliation:
Electronic Ceramics Division 1842 and Ceramics Development Division 1845, Sandia National Laboratories, Albuquerque, New Mexico 87185
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Abstract

The liquidus relations in the system YO1.5–BaO–CuOx in air in the compositional region near the superconducting oxide YBa2Cu3Ox were studied by differential thermal analysis, x-ray diffraction, electron microprobe analysis, and visual observation. The temperatures of 11 invariant points and the corresponding reactions were determined. YBa2Cu3Ox was found to melt incogruently at 1015 °C to Y2BaCuO5, which in turn melts incongruently to Y2O3 at 1270 °C. These reactions mean that preparing the superconducting phase by melting and rapid cooling will result in the presence of these two phases as well. The peritectic reaction YBa2Cu3Ox + CuO⇉Y2BaCuO5 + liquid at 940 °C accounts for the observation of partial melting, improved synthesis purity, and grain growth at temperatures of 950 °C. The determination of these invariant temperatures and reactions provide insight into optimal processing conditions.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 6 , December 1988 , pp. 1279 - 1291
Copyright
Copyright © Materials Research Society 1988

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References

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