Microstructure and superconducting properties of Dy–Ba–Cu–O bulk superconductors fabricated in different oxygen atmospheres

We have investigated the effect of microstructure and superconducting properties of melt-textured Dy–Ba–Cu–O bulk superconductors on various oxygen partial pressures in melt processing. The c-axis-oriented Dy–Ba–Cu–O bulk superconductors are melt textured in 1% O 2–Ar, air and pure O 2. It is found...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2005-10, Vol.426, p.660-665
Main Authors: Tanaka, H., Nariki, S., Sakai, N., Hirabayashi, I., Murakami, M., Takizawa, T.
Format: Article
Language:English
Subjects:
Bulk superconductor
Dy–Ba–Cu–O
Melt processing
Microstructure
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Summary:We have investigated the effect of microstructure and superconducting properties of melt-textured Dy–Ba–Cu–O bulk superconductors on various oxygen partial pressures in melt processing. The c-axis-oriented Dy–Ba–Cu–O bulk superconductors are melt textured in 1% O 2–Ar, air and pure O 2. It is found that the distribution of voids in the microstructure depends on oxygen pressures. The number of voids decreases in a sample fabricated in O 2. The peak effect is observed in J c– B curves of these samples except for the sample fabricated in 1% O 2. Such behavior is similar to those found in Nd– and Sm–Ba–Cu–O. These results indicate the possibility of the Dy/Ba substitution.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2005.02.068