Promotion of melt-assisted growth in Bi-2223 tapes utilizing rapid heating rates
Promotion of melt-assisted growth in Bi-2223 tapes utilizing rapid heating rates
Recent differential thermal analysis studies on green Bi-2223 tapes showed two phase transitions, with onset temperatures 800 and 820 °C. From microstructural examination of the long-term phase formation in the tapes the higher temperature endotherm was associated with a partial melt. In this study it is demonstrated how control of the heating rate can promote the partial melt (characterized by DTA), and thereby improve the transport current, Ic. XRD, SEM and transport measurements in field show microstructure features typical of an increased volume of liquid phase: a reduction in secondary phase volume and pores with a corresponding increase in c-plane texture.
526-530
Avgeros, S.
5fe69264-5fe3-4431-812b-952a9a5c3ec4
Al-Mosawi, M.
2b6de29b-dca2-4b70-97cf-d554095f0841
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
2005
Avgeros, S.
5fe69264-5fe3-4431-812b-952a9a5c3ec4
Al-Mosawi, M.
2b6de29b-dca2-4b70-97cf-d554095f0841
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Avgeros, S., Al-Mosawi, M., Young, E.A. and Yang, Y.
(2005)
Promotion of melt-assisted growth in Bi-2223 tapes utilizing rapid heating rates.
Superconductor Science and Technology, 18 (4), .
(doi:10.1088/0953-2048/18/4/024).
Abstract
Recent differential thermal analysis studies on green Bi-2223 tapes showed two phase transitions, with onset temperatures 800 and 820 °C. From microstructural examination of the long-term phase formation in the tapes the higher temperature endotherm was associated with a partial melt. In this study it is demonstrated how control of the heating rate can promote the partial melt (characterized by DTA), and thereby improve the transport current, Ic. XRD, SEM and transport measurements in field show microstructure features typical of an increased volume of liquid phase: a reduction in secondary phase volume and pores with a corresponding increase in c-plane texture.
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Published date: 2005
Additional Information:
Second of two papers concluding a few years of progressive work. Contributes not only to the engineering of Bi-2223 tapes, which has a short-term relevance for high current applications, but also in the longer term towards a poorly understood and complicated area of materials science.
Identifiers
Local EPrints ID: 23058
URI: http://eprints.soton.ac.uk/id/eprint/23058
ISSN: 0953-2048
PURE UUID: 2d968f65-f8ed-4bf0-85de-14939f76c48c
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Date deposited: 15 Mar 2006
Last modified: 16 Mar 2024 02:44
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Author:
S. Avgeros
Author:
M. Al-Mosawi
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