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Relation of starting precursors to the resulting high-Tc phases in the Pb and Sb doped Bi—Sr—Ca—Cu—O system

Published online by Cambridge University Press:  03 March 2011

F. Constantinescu ,
R. Holiastou ,
D. Niarchos ,
G.K. Nicolaides ,
F. Vasiliu ,
C. Bunescu  and
G. Aldica
F. Constantinescu
Affiliation:
Institute of Optoelectronics, Bucharest-Magurele, Romania
R. Holiastou
Affiliation:
Institute of Materials Science, NCSR “Demokritos”, Attiki 15310, Greece
D. Niarchos
Affiliation:
Institute of Materials Science, NCSR “Demokritos”, Attiki 15310, Greece
G.K. Nicolaides
Affiliation:
Institute of Materials Science, NCSR “Demokritos”, Attiki 15310, Greece
F. Vasiliu
Affiliation:
Research Institute for Aircraft Materials (INCREST), Romania
C. Bunescu
Affiliation:
METAV S.A., Bucharest, Romania
G. Aldica
Affiliation:
Institute of Physics and Technology of Materials, Bucharest-Magurele, Romania
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Abstract

The introduction of more reactive precursors for Pb and Sr (oxalates), as well as Ca (citrate) and the use of a Bi nitrate decomposition route, has increased the percentage of the high-Tc (2223) phase in the Bi—Sr—Ca—Cu—O (BSCCO) system. Partial substitution of Bi(Pb) with Sb gives an almost single (2223) phase sample. In addition, a single (2212) phase sample is obtained when high purity Bi2O3 is used as a precursor, whereas Bi acetate leads to semiconducting behavior. The morphology of the samples is studied with a scanning electron microscope (SEM), the stoichiometry with energy-dispersive x-ray analysis (EDAX), and the structure with x-ray diffraction (XRD), while the superconducting properties are investigated by dc-resistivity, ac-susceptibility, and SQUID magnetometry techniques.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 292 - 296
Copyright
Copyright © Materials Research Society 1994

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References

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