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Microstructures and critical currents in melt-processed YBCO

✍ Scribed by H. Fujimoto; T. Taguchi; M. Murakami; N. Nakamura; N. Koshizuka

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
492 KB
Volume
32
Category
Article
ISSN
0011-2275

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✦ Synopsis

YBaCuO bulk superconductors prepared by the melt-powder-melt-growth process (MPMG) have a high critical current density. It has been found that non-superconducting Y2BaCuO 5 (211) particles dispersed in the 123 superconducting phase can work as strong pinning centres, resulting in higher Jc values. Though 211 particles are considered to be the main pinning centres, defects such as twins and stacking faults are observed in melt-processed YBCO. In this study the effect of twin boundaries on the flux pinning was measured magnetically. The results indicate that twin planes contribute to flux pinning, but that their effect is not large in MPMG samples.

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YBa2Cu307 crystals fabricated by a quench and melt growth process contain fine Y2BaCuO5 particles. These fine precipitates are considered to have three beneficial effects: they suppress crack formation; they promote oxygen diffusion; and they act as pinning centres. Such crystals exhibit larger flux