Influence of precursors and synthetic conditions on carbon trapping and related superconducting properties in bulk YBCO

The influences of starting precursors and conditions of densification on carbon retention in YBCO ceramics are investigated. It is shown that both the degree of densification and the kinetics of densification have strong effects on the carbon trapping behaviour. By controlling the densification kine...

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Bibliographic Details
Published in:Journal of materials science 1997, Vol.32 (2), p.409-413
Main Authors: WANG, J, MONOT, I, DELAMARE, M. P, DESGARDIN, G
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Bulk density
Carbon
Carbon content
Ceramic industries
Ceramics
Chemical industry and chemicals
Critical temperature
Densification
Electrotechnical and electronic ceramics
Exact sciences and technology
Kinetics
Materials science
Optimization
Precursors
Presintering
Sintering (powder metallurgy)
Superconductivity
Technical ceramics
Trapping
YBCO superconductors
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Summary:The influences of starting precursors and conditions of densification on carbon retention in YBCO ceramics are investigated. It is shown that both the degree of densification and the kinetics of densification have strong effects on the carbon trapping behaviour. By controlling the densification kinetics, a highly sintered density can be achieved with low carbon trapping in YBCO ceramics. Moreover, one observes that even in a melt-textured sample, depending on the quality of the precursor powders and on the presintering conditions, the residual carbon content can still be high, and depression of the superconducting critical temperature, Tc, may still occur. From a systematic investigation and characterization, we have established a correlation between the superconducting transition characteristics and the residual carbon level. Such a correlation can be used as a guideline for the control of carbon content and the optimization of superconducting properties in YBCO materials.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1018509618012