CUED Publications database

Comparison of the effects of platinum and CeO$_2$ on the properties of single grain, Sm-Ba-Cu-O bulk superconductors

Zhao, W and Shi, Y and Radusovska, M and Dennis, AR and Durrell, JH and Diko, P and Cardwell, DA (2016) Comparison of the effects of platinum and CeO$_2$ on the properties of single grain, Sm-Ba-Cu-O bulk superconductors. Superconductor Science and Technology, 29. ISSN 0953-2048

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Abstract

SmBa$_2$Cu$_3$O$_{7−δ}$ (Sm-123) is a light-rare-earth barium-cuprate (LRE-BCO) high-temperature superconductor (HTS) with significant potential for high field industrial applications. We report the fabrication of large, single grain bulk [Sm–Ba–Cu–O (SmBCO)] superconductors containing 1 wt% CeO$_2$ and 0.1 wt% Pt using a top-seeded melt growth process. The performance of the SmBCO bulk superconductors containing the different dopants was evaluated based on an analysis of their superconducting properties, including critical transition temperature, $T_c$ and critical current density, $J_c$ , and on sample microstructure. We find that both CeO$_2$ and Pt dopants refine the size of Sm$_2$BaCuO$_5$ (Sm-211) particles trapped in the Sm-123 superconducting phase matrix, which act as effective flux pinning centres, although the addition of CeO$_2$ results in broadly improved superconducting performance of the fully processed bulk single grain. However, 1 wt% CeO$_2$ is significantly cheaper than 0.1 wt% Pt, which has clear economic benefits for use in medium to large scale production processes for these technologically important materials. Finally, the use of CeO$_2$ results generally in the formation of finer Sm-211 particles and to the generation of fewer macro-cracks and Sm-211 free regions in the sample microstructure.

Item Type: Article
Uncontrolled Keywords: high temperature superconductors SmBCO doping effects comparison of Pt and CeO$_2$
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:30
Last Modified: 09 Sep 2021 01:11
DOI: 10.1088/0953-2048/29/12/125002