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Oxygen Nonstoichiometry and Chemical Diffusion Coefficient of Oxygen in Ba2YCu3O7−x

  • Tsuneo Matsui
  • Keiji Naito
  • Sadaaki Hagino
Part of the NATO ASI Series book series (ASIC, volume 276)

Abstract

The oxygen nonstoichiometry x and the chemical diffusion coefficient of oxygen in Ba2YCu3O7−x were measured by means of thermogravimetry as a function of oxygen partial pressure and temperature over the ranges 102 <Po2/Pa<105and 698<T/K<1173. The oxygen partial pressure dependence of x in Ba2Cu3O7−x obtained in this study was in good agreement with those previously reported by other researchers. The chemical diffusion coefficients of oxygen in Ba2YCu3O7−x with various oxygen nonstoichiometry x=0.063–0.77 were measured, and they increased with decreasing oxygen nonstoichiometry x at constant temperature. The compositional dependence of the chemical diffusion coefficient changed at about x=0.35, indicating the occurrence of the phase transition from the tetragonal to the orthorhombic structure. The activation energies of the chemical diffusion coefficients of oxygen in Ba2YCu3O7−x with various x were observed to be about 115·kJ mol−1, irrespective of oxygen nonstochiometry x. The self-diffusion coefficient of oxygen and the diffusion coefficient of oxygen vacancy were calculated from the chemical diffusion coefficient, and were compared with those of another superconductor La2−ySryCuO4−x.

Keywords

Oxygen Vacancy Oxygen Partial Pressure Orthorhombic Structure Chemical Diffusion Ammonium Oxalate 
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

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Tsuneo Matsui
    • 1
  • Keiji Naito
    • 1
  • Sadaaki Hagino
    • 2
  1. 1.Department of Nuclear Engineering, Faculty of EngineeringNagoya UniversityNagoyaJapan
  2. 2.Superconducting Materials Development Team, Central Research InstituteMitsubishi Metal CorporationKitabukuro-cho, Omiya, SaitamaJapan

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