Microstructural evolution in multiseeded YBCO bulk samples grown by the TSMG process
Authors
Goodfellow, Amy
Shi, Yunhua
Grovenor, CRM
Speller, SC
Publication Date
2016-10-17Journal Title
Superconductor Science and Technology
ISSN
0953-2048
Publisher
Institute of Physics Publishing
Volume
29
Issue
11
Number
115005
Language
English
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Goodfellow, A., Shi, Y., Durrell, J., Dennis, T., Cardwell, D., Grovenor, C., & Speller, S. (2016). Microstructural evolution in multiseeded YBCO bulk samples grown by the TSMG process. Superconductor Science and Technology, 29 (11. 115005)https://doi.org/10.1088/0953-2048/29/11/115005
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.
Keywords
YBCO, bulk, microstructure
Relationships
Is supplemented by: https://doi.org/10.5287/bodleian:R59rr6pAk
Sponsorship
Engineering and Physical Sciences Research Council (Grant ID: EP/K02910X/1)
Funder references
EPSRC (EP/P00962X/1)
EPSRC (EP/K02910X/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1088/0953-2048/29/11/115005
This record's URL: https://www.repository.cam.ac.uk/handle/1810/261416
Rights
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International