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Processing and properties of bulk Y-Ba-Cu-O superconductors fabricated by top seeded melt growth from precursor pellets containing a graded CeO<inf>2</inf> composition

Zhai, W and Shi, Y and Durrell, JH and Dennis, AR and Zhang, Z and Cardwell, DA (2015) Processing and properties of bulk Y-Ba-Cu-O superconductors fabricated by top seeded melt growth from precursor pellets containing a graded CeO<inf>2</inf> composition. Crystal Growth and Design, 15. pp. 907-914. ISSN 1528-7483

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Abstract

© 2015 American Chemical Society. The existence of a zone containing a low concentration of Y 2 BaCuO 5 (Y-211) phase particles in the vicinity of the seed in single grain, bulk Y-Ba-Cu-O (YBCO) superconductors fabricated by the top seeded melt growth (TSMG) technique has been reported, suggesting the presence of low intrinsic magnetic flux pinning, and hence reduced trapped field, in this region of the sample. The possibility of introducing additional pinning centers in the vicinity of the seed in single grain YBCO, therefore, may be effective in improving the applied magnetic properties of these technologically important materials. Single grain, bulk YBCO superconductors fabricated from precursor pellets containing a graded CeO 2 composition have been prepared corresponding to a secondary phase content of 2 wt % CeO 2 beneath the seed and 1 wt % CeO 2 at the outer, "U" shape cross-section, of the sample. The resulting graded single grain YBCO superconductors exhibit enhanced trapped field compared to standard YBCO superconductors fabricated by TSMG from precursor pellets containing purely 1 wt % CeO 2 . The influence of CeO 2 content on the microstructure, growth process, and superconducting properties of bulk, single grain YBCO superconductors fabricated by TSMG has been investigated and used to explain the increased trapped field ability of the graded composition.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:57
Last Modified: 21 Sep 2017 01:36
DOI: