Thermal stability and oxygen nonstoichiometry of BSCCO superconductors

Investigation of HTSC thermal stability in air shows that the samples, containing 75% of 2223 phase and 25% of 2212 phase, at 800°C does not change phase ratio and transition parameters. At lower annealing temperature (700° or 750°C) there appear “tail” on resistive curve and traces of new phases. S...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1991-12, Vol.185, p.471-472
Main Authors: Tret'yakov, Y.D., Os'kina, T.E.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Physics
Specific phase transitions
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Summary:Investigation of HTSC thermal stability in air shows that the samples, containing 75% of 2223 phase and 25% of 2212 phase, at 800°C does not change phase ratio and transition parameters. At lower annealing temperature (700° or 750°C) there appear “tail” on resistive curve and traces of new phases. Subsequrnt annealing of these samples at 800°C restores initial parameters. The highest oxygen nonstoichiometry index δ of Pb-cpntaining 2223 phase equal to 0.20±0.01 is reached at 750°C, i.e. at lower boundary of highest homologue thermal stability.
ISSN:0921-4534
1873-2143
DOI:10.1016/0921-4534(91)92038-D