Measurement of Chemical Diffusion Coefficients in Non-Stoichiometric Oxides Using Solid State Electrochemical Techniques

  • B. C. H. Steele
Part of the Materials Science Research book series (MSR, volume 9)


The application of solid state electrochemical techniques to the measurement of chemical diffusion coefficients in non-stoichiometric oxides is discussed, with particular reference to data obtained for UO2+x using Zr0.9 Y0.1O1.95 electrolytes. The development of the technique using beta-alumina electrolytes to examine the thermodynamic and transport properties of sodium and potassium in selected oxides is described. Partial molar thermodynamic data was obtained for the systems Na0.6 WO3, Na0.4 WO3, Na0.32V2O5, and Nax Fe7O11-y. These data can be used, for example, to calculate that the theoretical specific energy of a battery system incorporating the vanadium bronzes as cathode materials would be approximately 400Wh/Kg. The mass transport properties of the sodium vanadium and tungsten bronzes, however, would not meet the requirements of a solid state battery system as potentiostatic measurements indicate that the chemical diffusion coefficient (D) values for sodium are less than 10-12 cm2/s. The mass transport properties of the beta-ferrite (NaxFe7O11-7) are more attractive as values for D at 200°C approach 10-6 cm2/s. The thermodynamic and transport properties of these materials are briefly discussed in terms of the available structural information.


Cathode Material Chemical Diffusion Tungsten Bronze Chemical Diffusion Coefficient Tungsten Bronze Structure 


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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • B. C. H. Steele
    • 1
  1. 1.Imperial CollegeLondon, S.W. 7England

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