Journal
PHYSICA C
Volume 339, Issue 4, Pages 269-280Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0921-4534(00)00361-0
Keywords
Bi-2212; oxygen nonstoichiometry; thermogravimetric analysis; defect structure
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Oxygen nonstoichiometry of the high-T-c superconductor Bi2Sr2CaCu2O8+4 has been investigated by thermogravimetric techniques from 300 degreesC to the phase stability limits with oxygen partial pressure ranging from 1 to 10(-4) atm. Although it was not possible to remove the entire oxygen excess due to phase decomposition, Delta could be reversibly varied from 0.23 to 0.15. Depending on the annealing temperature, two different behaviours have been observed. At low temperature, the oxygen exchange consists in the intercalation of O2- ions, while over 800 degreesC, oxygen vacancies are likely to be created in the lattice. The consequences on the superconducting transition temperature are revealed. It appears that the physical properties of the material (e.g., T-c) can be governed at constant oxygen content through the control of the oxygen excess distribution. (C) 2000 Elsevier Science B.V. All rights reserved.
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