Nonstoichiometry and Defect Equilibria in YBa2Cu3Ox
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.
KeywordsOxygen Content Oxygen Vacancy Oxidation Reaction Interstitial Site Reference Structure
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