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Comparison of The Stability of Bi2Sr2CaCu2O8+y with YBa2Cu3O6,5+y in Various Solutions

  • H. K. Liu
  • S. X. Dou
  • A. J. Bourdillon
  • C. C. Sorrell
Conference paper

Abstract

The chemical behaviour of both YBa2Cu3O6 . 5 + y {123} and Bi2Sr2CaCυ2O8+y {2212} in various solvents was studied in a comparative manner. In both compounds superconductivity apparently depends on a high oxidation state of Cu. Electrochemical corrosion rates were measured by a variety of techniques and are related to the concentration of labile Cu3+ ions in the specimens. Generally {2212} is the more stable compound, except in strongly basic solutions owing to the amphoteric nature of Bi. In the presence of acidic or basic solutions Bi3+ is oxidized to Bi4+ or Bi5+ by the high oxidation state of Cu in {2212} (similar to oxidation by Na2O2), demonstrating a common feature of cuprate superconductors. The concentration of labile ions was determined by the volumetric measurement of evolved oxygen from acid solution, and the technique was extended to measure the concentration of undecomposed or re-formed carbonates after sintering.

Keywords

High Oxidation State Sintered Pellet Cuprate Superconductor Brown Precipitate Shrink Core Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Japan 1989

Authors and Affiliations

  • H. K. Liu
    • 1
    • 2
  • S. X. Dou
    • 1
    • 2
  • A. J. Bourdillon
    • 1
  • C. C. Sorrell
    • 1
  1. 1.School of Materials Science and EngineeringUniversity of New South WalesKensingtonAustralia
  2. 2.Northeast University of TechnologyShenyangPeople’s Republic of China

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