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Nonstoichiometry and Defect Equilibria in YBa2Cu3Ox

  • A. Mehta
  • D. M. Smyth
Part of the NATO ASI Series book series (ASIC, volume 276)

Abstract

The value of x in YBa2Cu3Ox varies from just under 6 to nearly 7 as a function of temperature and oxygen activity, P(O2). Published data on the oxygen content, determined by thermogravimetry, have been fit by a simple equilibrium oxidation reaction that involves the filling of vacancies in the reference structure, YBa2Cu3O7, A single thermally-activated mass-action constant, with a single enthalpy of oxidation, fits the experimental data quantitatively over the range 450 < T < 850°C, −3 < log P(O2) < 0, and 6.2 < x < 6.9.

Keywords

Oxygen Content Oxygen Vacancy Oxidation Reaction Interstitial Site Reference Structure 
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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References

  1. 1.
    K. Kishio, J. Shimoyama, T. Hasegawa, K. Kitazawa, and K. Fueki, Jap. J. Appl. Phys. 26, L1228(1987).CrossRefGoogle Scholar
  2. 2.
    P. K. Gallagher, Adv. Ceramic Mat. 2, No. 3B, Special Issue, 632 1987).Google Scholar
  3. 3.
    E. K. Chang, D. J. L. Hong, A. Mehta, and D. M. Smyth, Mat. Letters 6(8,9), 251 (1988).CrossRefGoogle Scholar
  4. 4.
    A. Santoro, S. Miraglia, F. Beech, S. A. Sunshine, D. W. Murphy, L. F. Schneemeyer, and J. V. Waszczak, Mat. Res. Bull. 22, 1007 (1987).CrossRefGoogle Scholar
  5. 5.
    M.-Y. Su, S. E. Dorris, and T. O, Mason, submitted to J. Solid State Chem.Google Scholar
  6. 6.
    L. R. Morss, D. C. Sonnenberger, and R. J. Thorn, Inorg. Chem. 27, 2106 (1988).CrossRefGoogle Scholar
  7. 7.
    C. Chaillout, M. A. Alario-Franco, J. J. Capponi, J. Chenavas, P. Strobel, and M. Marezio, Solid State Commun. 65, 283 (1988).CrossRefGoogle Scholar
  8. 8.
    H. Verweij, Solid State Commun. 64, 1213 (1987)CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • A. Mehta
    • 1
  • D. M. Smyth
    • 1
  1. 1.Materials Research Center #32Lehigh UniversityBethlehemUSA

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