CUED Publications database

An improved top seeded infiltration growth method for the fabrication of Y-Ba-Cu-O bulk superconductors

Namburi, DK and Shi, Y and Palmer, KG and Dennis, AR and Durrell, JH and Cardwell, DA (2016) An improved top seeded infiltration growth method for the fabrication of Y-Ba-Cu-O bulk superconductors. Journal of the European Ceramic Society, 36. pp. 615-624. ISSN 0955-2219

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Abstract

© 2015 The Authors. Buffer-aided top seeded infiltration and growth (TSIG) with a suitable liquid phase reservoir has been compared with the top seeded melt growth (TSMG) process and applied successfully to fabricate single grain YBa 2 Cu 3 O 7-δ (YBCO) bulk superconductors. A Yb-based liquid phase has been observed to yield the homogeneous, high density YBCO single grains by the TSIG technique. Sintering the Y 2 BaCuO 5 (Y-211) preform prior to TSIG has been found to be critical in retaining the shape of the sample during the infiltration and growth process. A number of advantages of the TSIG process have been demonstrated, including a dramatic reduction in sample shrinkage and a general improvement in bulk microstructure. TSIG processed samples also exhibit a fine and even distribution of unreacted, embedded Y-211 inclusions that play a key role in flux pinning in the fully processed bulk material. A YBCO sample of diameter 25mm fabricated by the optimised buffer-aided TSIG process was able to trap a field of 0.63T at 77K, which is the highest value of trapped field ever reported for a YBCO sample fabricated by the TSIG process. The technique reported here has the potential to improve further the microstructural and superconducting properties of single grain bulk YBCO, which enhances further the applications potential of these materials.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:05
Last Modified: 07 Sep 2017 01:44
DOI: