CUED Publications database

Microstructural evolution in multiseeded YBCO bulk samples grown by the TSMG process

Goodfellow, A and Shi, YH and Durrell, JH and Dennis, AR and Cardwell, DA and Grovenor, CRM and Speller, SC (2016) Microstructural evolution in multiseeded YBCO bulk samples grown by the TSMG process. Superconductor Science and Technology, 29.

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Abstract

Superconducting single-grain YBCO bulk samples with the ability to trap high magnetic fields can be grown using the top-seeded melt-growth process. Multiseeding techniques have the potential to enable larger diameter bulks to be grown, but the performance of these materials is not yet comparable to the single-seeded bulks. Here we carry out detailed three-dimensional microstructural characterisation on a multiseeded sample grown with the seeds aligned in the 0°-0° geometry using high resolution microanalysis techniques. Chemical and structural variations have been correlated with the trapped field distribution in three separate slices of the sample. The top slice of the sample shows four peaks in trapped field, indicating that the current flows in four separate loops rather than in one large loop within the sample. This has been explained by the build-up in insulating Y-211 particles where the growth fronts from the two seeds meet, forming a barrier to current flow, as well as the low Y-211 content (and hence low $J_c$) of the large $c$-axis growth sector.

Item Type: Article
Uncontrolled Keywords: YBCO bulk microstructure
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:07
Last Modified: 21 Nov 2017 03:49
DOI: