Growth rate of YBCO-Ag superconducting single grains
Publication Date
2017Journal Title
IOP Conference Series: Materials Science and Engineering
Conference Name
CEC/ICMC 2017
ISSN
1757-8981
Publisher
IOP Publishing
Volume
279
Issue
1
Type
Conference Object
This Version
VoR
Metadata
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Congreve, J., Shi, Y., Dennis, T., Durrell, J., & Cardwell, D. (2017). Growth rate of YBCO-Ag superconducting single grains. IOP Conference Series: Materials Science and Engineering, 279 (1) https://doi.org/10.1088/1757-899X/279/1/012027
Abstract
The large scale use of (RE)Ba₂Cu₃O₇ bulk superconductors, where RE=Y, Gd, Sm, is, in part, limited by the relatively poor mechanical properties of these inherently brittle ceramic materials. It is reported that alloying of (RE)Ba₂Cu₃O₇ with silver enables a significant improvement in the mechanical strength of bulk, single grain samples without any detrimental effect on their superconducting properties. However, due to the complexity and number of inter-related variables involved in the top seeded melt growth (TSMG) process, the growth of large single grains is difficult and the addition of silver makes it even more difficult to achieve successful growth reliably. The key processing variables in the TSMG process include the times and temperatures of the stages within the heating profile, which can be derived from the growth rate during the growth process. To date, the growth rate of the YBa₂Cu₃O₇-Ag system has not been reported in detail and it is this lacuna that we have sought
to address. In this work we measure the growth rate of the YBCO-Ag system using a method based on continuous cooling and isothermal holding (CCIH). We have determined the growth rate by measuring the side length of the crystallised region for a number of samples for specified isothermal hold temperatures and periods. This has enabled the growth rate to be modelled and from this an optimized heating profile for the successful growth of YBCO-Ag single grains to be derived.
Sponsorship
EPSRC (1619794)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1088/1757-899X/279/1/012027
This record's URL: https://www.repository.cam.ac.uk/handle/1810/274247
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