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Annealing and Strain Effects on Tl-Ba-Ca-Cu-O Crystals and Ceramics

Published online by Cambridge University Press:  21 February 2011

E. L. Venturini ,
B. Morosin ,
D. S. Ginley ,
J. F. Kwak ,
J. E. Schirber ,
R. J. Baughman  and
R. A. Graham
E. L. Venturini
Affiliation:
Sandia National Laboratories, Division 1153, Albuquerque, NM 87185-5800
B. Morosin
Affiliation:
Sandia National Laboratories, Division 1153, Albuquerque, NM 87185-5800
D. S. Ginley
Affiliation:
Sandia National Laboratories, Division 1153, Albuquerque, NM 87185-5800
J. F. Kwak
Affiliation:
Sandia National Laboratories, Division 1153, Albuquerque, NM 87185-5800
J. E. Schirber
Affiliation:
Sandia National Laboratories, Division 1153, Albuquerque, NM 87185-5800
R. J. Baughman
Affiliation:
Sandia National Laboratories, Division 1153, Albuquerque, NM 87185-5800
R. A. Graham
Affiliation:
Sandia National Laboratories, Division 1153, Albuquerque, NM 87185-5800
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Abstract

Superconducting transition temperatures (Tc'S) in the Tl-Ba-Ca-Cu-O system are shown to be a function of processing for both single crystals and bulk ceramics. Crystals with the identical structural phase and nominal composition but slightly different lattice constants can have significant differences in Tc. We report the effects of high temperature annealing in vacuum or flowing oxygen on Tc for single crystal plates of two common phases with nominal stochiometries Tl2Ba2Ca1Cu2O8 and Tl2Ba2Ca2Cu3O10. Contradictory results on nominally similar crystals suggest that strain, Tl content and TI/Ca site disorder are as important as the oxygen stoichiometry in determining Tc This interpretation is supported by complementary annealing studies in bulk ceramic, including a powder where Tc increased by 5 K following high-pressure shock loading which introduced substantial residual strain.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 239
Copyright
Copyright © Materials Research Society 1989

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References

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