Investigation of the initial stages of processing Bi-2223 multifilamentary tapes by analytical electron microscopy

Analytical transmission electron microscopy (TEM) was used to probe the formation of liquid phases in multifilamentary Bi-2223 tapes. Silver was found to nucleate small amounts of liquid phase early in the processing. However, liquid formation was primarily associated with the 14-24 AEC and time at...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2001-03, Vol.11 (1), p.2991-2994
Main Authors: Holesinger, T.G., Ayala, A., Baurceanu, R.M., Maroni, V.A.
Format: Article
Language:English
Subjects:
Applied sciences
Charge carrier processes
Electrical engineering. Electrical power engineering
ELECTRON MICROSCOPY
Exact sciences and technology
Laboratories
Liquid phases
Liquids
Materials
MATHEMATICAL ANALYSIS
Multifilamentary superconductors
PHASES
PRECIPITATES
Precipitation
Scanning electron microscopy
Silver
Superconducting films
Superconducting materials
Superconducting tapes
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TAPE
Temperature
Transmission electron microscopy
US Department of Energy
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Summary:Analytical transmission electron microscopy (TEM) was used to probe the formation of liquid phases in multifilamentary Bi-2223 tapes. Silver was found to nucleate small amounts of liquid phase early in the processing. However, liquid formation was primarily associated with the 14-24 AEC and time at temperature (induction period) was the major factor determining the amounts of lead-rich liquid phase formation in these tapes. The compositions of the lead-rich liquid phases were measured quantitatively. The data presented is consistent with a mechanism whereby Bi-2223 can precipitate from a liquid phase.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.919691