(Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, )
Keywords:
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CLC:
PACS:
R318.08
DOI:
10.7502/j.issn.1674-3962.2013.09.03
DocumentCode:
Abstract:
This paper presents a novel technique-biomimeral method to synthesize strong anisotropic platelike crystallites of YBa2Cu3O7-δ (YBCO) superconductor powders. The typical size of the as obtained YBCO powder is 5 μm × 5 μm × 1 μm. All these grains self assemble to region with local orientation, which allow the intergranular supercurrent pass along average 3-5 grains. TEM shows that every platelike grain expresses hierarchical structure. Due to this particular structure, the intragranular critical current density reaches 0.1 MAcm?2 at 77K and self field, which is over 10 times higher than that of the commercial YBCO powder. This paper also reveals a YBCO conductor fabricated by platelike YBCO powders, which can really allow supercurrent flow. The present work provides an important and new route for fabricating YBCO conductors which has the potential applications to solve the limitation existed in that traditional thin film approaches.