Transmission Electron Miscroscopy Observation of the Decomposition of YBa 2 Cu 4 O 8 into YBa 2 Cu 3 O 7-δ and CuO

The decomposition of Yba 2 Cu 4 O 8 (Y-124) into Yba 2 Cu 3 O 7-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, J c , which is...

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Bibliographic Details
Published in:Journal of materials research 1997-04, Vol.12 (4), p.906-914
Main Authors: Reder, M., Krelaus, J., Müller, D., Heinemann, K., Freyhardt, H. C.
Format: Article
Language:English
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Summary:The decomposition of Yba 2 Cu 4 O 8 (Y-124) into Yba 2 Cu 3 O 7-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, J c , 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 J c 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.
ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.1997.0130