Nonstoichiometry and Defect Equilibria in YBa2Cu3Ox

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


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.


Oxygen Content Oxygen Vacancy Oxidation Reaction Interstitial Site Reference Structure 
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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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