Abstract
CeO2-based solid solutions with a fluorite structure are promising materials as electrolytes of medium-temperature electrochemical devices: electrolytic cells, oxygen sensors, and solid oxide fuel cells. In this work, studies are presented of the effect of the dopant cation radius and its concentration on the physico-chemical properties of the Ce1 − x Ln x O2 − δ solid solutions (x = 0–0.20; Ln = La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb) and also of multicomponent solid solutions of Ce1 − x Ln x/2Ln′ x/2O2 − δ (x = 0–0.20; Ln = Sm, La, Gd and Ln′ = Dy, Nd, Y) and Ce1 − x − y Sm x M y O2 − δ (M = Ca, Sr, Ba) obtained using the solid-phase synthesis technique. Electric properties of the samples were studied in the temperature range of 623–1173 K and in the oxygen partial pressure range of 0.01–10−22 MPa. The values of oxygen critical pressure \(\left( {p_{O_2 }^* } \right)\) are presented, at which the ionic and electron conductivity values are equal. The values were calculated on the basis of experimental dependences at 1023 K at the assumption that the ionic conductivity value is determined only by the dopant concentration and its effective ionic radius and is independent of the oxygen partial pressure.
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Original Russian Text © E.Yu. Pikalova, V.G. Bamburov, A.A. Murashkina, A.D Neuimin, A.K. Demin, S.V. Plaksin, 2011, published in Elektrokhimiya, 2011, Vol. 47, No. 6, pp. 738–744.
Published on the basis of a presentation delivered at the Xth Conference “Fundamental Problems of Solid State Ionics”, Chernogolovka, 2010.
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Pikalova, E.Y., Bamburov, V.G., Murashkina, A.A. et al. Solid electrolytes based on CeO2 for medium-temperature electrochemical devices. Russ J Electrochem 47, 690–696 (2011). https://doi.org/10.1134/S1023193511060127
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DOI: https://doi.org/10.1134/S1023193511060127