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Dependence of Critical Current Density on Granular Arrangement in Ceramic Superconductors

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Abstract

The critical current density Jc of bulk ceramic superconductors is often several orders of magnitude lower than that of a single crystal or oriented film of the same material due to the weak links residing at the boundaries between single crystals within the ceramic sample. Assuming that the rate of electron transport within each single crystal is much faster than the average rate of electron transport between adjacent single crystals, a working hypothesis of Jc enhancement by granular reorientation is formulated which includes the "brickwall" model and melt-texturing as special cases with long-range granular alignment which usually leads to rigid and brittle bulk samples. Simple geometric considerations show that only short-range local granular alignment is necessary for high Jc. For mis reason, it should be possible to make flexible superconducting wires and tapes for commercial applications at or above 77K.

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Acknowledgement

We thank Dr. Shushil Patel for experimental advice, and Messrs. G. Sagerman and M. Michalski for valuable technical assistance.

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Authors and Affiliations

  1. Department of Chemistry and New York State, Institute on Superconductivity, State University of New York, Buffalo, NY, 14214, USA

    Jui H. Wang & Zhifeng Ren

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  1. Jui H. Wang
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  2. Zhifeng Ren
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Wang, J.H., Ren, Z. Dependence of Critical Current Density on Granular Arrangement in Ceramic Superconductors. MRS Online Proceedings Library 275, 663–667 (1992). https://doi.org/10.1557/PROC-275-663

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  • DOI: https://doi.org/10.1557/PROC-275-663

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