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High temperature X-ray diffraction studies of the decomposition mechanism of YBa2Cu3O7−δ at an oxygen partial pressure less than 10 Pa

Published online by Cambridge University Press:  10 January 2013

W. Pitschke ,
W. Bieger ,
G. Krabbes  and
U. Wiesner
W. Pitschke
Affiliation:
Institut für Festkörper und Werkstofforschung Dresden e.V., Postfach, D-01171 Dresden, Germany
W. Bieger
Affiliation:
Institut für Festkörper und Werkstofforschung Dresden e.V., Postfach, D-01171 Dresden, Germany
G. Krabbes
Affiliation:
Institut für Festkörper und Werkstofforschung Dresden e.V., Postfach, D-01171 Dresden, Germany
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Abstract

The crystallographic data of YBa2Cu3O7−δ, Y2BaCuO5, BaCu2O2, and YBa4Cu3O9 at high temperatures and p(O2)<10 Pa have been derived on the basis of HT-XRD measurements. Whereas Y2BaCuO5 expands nearly isotropically, YBa2Cu3O7−δ and BaCu2O2 show anisotropic expansions. Furthermore, the first decomposition step of the considered compounds at p(O2)<10 Pa was observed. BaCu2O2 melts congruently at T ≍ 1273 K and Y2BaCuO5 decomposes via a peritectic reaction into Y2O3, Y2BaO4 and melts at T ≍ 1323 K. A solid-state reaction into Y2BaCuO5 and BaCu2O2 was indicated for YBa2Cu3O7−δ at T ≍ 1123 K. Because YBa4Cu3O9 becomes unstable at T ≍ 1123 K, this compound cannot be formed by the primary decomposition reaction of YBa2Cu3O7−δ

Keywords

high temperatureX-ray powder diffractionY–Ba–Cu–O superconductorsdecomposition reactionssolid state transformations.
Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 3 , September 1995 , pp. 165 - 169
Copyright
Copyright © Cambridge University Press 1995

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