Abstract
The work presents the results of studying the mechanism of oxygen transport for a new promising class of oxygen-containing electrolytes based on lanthanum silicate with an apatite structure using impedance spectroscopy and isotopic oxygen heteroexchange. At 1000 K, in the case of samples with an optimum composition including codoped Fe and Al, σ ∼ 3 × 10−3 to 10−2 S/cm and D* reaches ∼10−8 cm2/s, which is close to the values of YSZ and Ce0.9Gd0.1O2 − δ (GDC). Lower energies of conductivity activation and oxygen diffusion for doped apatites (∼0.5–0.8 eV instead of ∼1 eV for GDC) and also equivalence as regards exchange of all oxygen atoms within apatite agree with the model, in which oxygen mobility is determined by a nonlinear cooperative migration process of oxygen atoms with fast exchange between interstitial and regular sites.
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Original Russian Text © V.A. Sadykov, T.S. Kharlamova, N.V. Mezentseva, S.N. Pavlova, E.M. Sadovskaya, V.S. Muzykantov, Yu.N. Bespalko, V.V. Usol’tsev, E.G. Zevak, T.A. Kriger, A.V. Ishchenko, N.F. Uvarovc, A.S. Ulikhinc, M.V. Chaikinac, C. Argirusis, 2011, published in Elektrokhimiya, 2011, Vol. 47, No. 4, pp. 453–467.
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Sadykov, V.A., Kharlamova, T.S., Mezentseva, N.V. et al. Studies of oxygen transport mechanism in electrolytes based on doped lanthanum silicate with apatite structure using techniques of oxygen isotopic heteroexchange and impedance spectroscopy. Russ J Electrochem 47, 427–441 (2011). https://doi.org/10.1134/S1023193511040136
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DOI: https://doi.org/10.1134/S1023193511040136