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Transmission Electron Miscroscopy Observation of the Decomposition of YBa2Cu4O8 into YBa2Cu3O7-δ and CuO

Published online by Cambridge University Press:  31 January 2011

M. Reder ,
J. Krelaus ,
D. Müller ,
K. Heinemann  and
H. C. Freyhardt
M. Reder
Affiliation:
Institut für Metallphysik, Universitäat Göttingen, Hospitalstraβ 3/7, 37073 Göttingen, Germany
J. Krelaus
Affiliation:
Institut für Metallphysik, Universitäat Göttingen, Hospitalstraβ 3/7, 37073 Göttingen, Germany
D. Müller
Affiliation:
Institut für Metallphysik, Universitäat Göttingen, Hospitalstraβ 3/7, 37073 Göttingen, Germany
K. Heinemann
Affiliation:
Institut für Metallphysik, Universitäat Göttingen, Hospitalstraβ 3/7, 37073 Göttingen, Germany
H. C. Freyhardt
Affiliation:
Institut für Metallphysik, Universitäat Göttingen, Hospitalstraβ 3/7, 37073 Göttingen, Germany
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Abstract

The decomposition of Yba2Cu4O8 (Y-124) into Yba2Cu3O7-δ (Y-123) and CuO at high temperatures has been expected to create Y-123 with finely dispersed CuO precipitates suitable for flux pinning. In fact, samples of thermally decomposed Y-124 exhibit a critical current density, Jc, which is enhanced with respect to the starting material as well as to pure Y-123. Transmission electron microscopy (TEM) studies of furnace annealed Y-124 were not suitable to clarify the reason for this Jc enhancement. Nevertheless, the formation and growth of CuO precipitates have been observed by in situ decomposition of the Y-124 starting material due to electron beam heating within the TEM.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 4 , April 1997 , pp. 906 - 914
Copyright
Copyright © Materials Research Society 1997

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