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Mixed Ionic-Electronic Conductivity of the Fluorite-Type Ce1 – x – yLaxPryO2 – δ Solid Solutions under Reducing Conditions

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Abstract—

The electrical conductivity of fluorite-type Ce1 – x – yLaxPryO2 – δ (x = 0.29–0.40, y = 0–0.14) solid solutions was studied over the oxygen partial pressure range from 10–20 to 0.5 atm at 973–1223 K. The (Сe,La)O2 – δ was shown to possess predominant anion conductivity with the oxygen ion transference numbers above 0.99 over the entire temperature range. The decreasing of the oxygen partial pressure leads to an increase in n-type electronic conduction. The data on total conductivity as a function of the oxygen partial pressure varying from 10–8 atm down to 10–20 atm was used to model the electronic and ionic defect formation and transport processes under reductive conditions. The concentrations of point defects and their diffusivities were calculated. The concentration of electrons localized at cerium cations, their mobility and, consequently, the partial n-type electronic conductivity were all found to decrease with the increasing of the dopants concentration. The oxygen-ion conductivity and the oxygen vacancy mobility both decreased with the increasing of the La3+, Pr3+, and Ce3+ cations’ total content. This behavior can be explained by the formation of point-defect clusters comprising Ln3+ and anion vacancies, which becomes more favorable with the addition of Ln3+.

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Funding

This work was financially supported by Russian Science Foundation (RSF) grant 17-79-30071.

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Authors and Affiliations

  1. Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    A. I. Ivanov, S. I. Bredikhin & V. V. Kharton

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  1. A. I. Ivanov
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  2. S. I. Bredikhin
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  3. V. V. Kharton
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Correspondence to A. I. Ivanov.

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Translated by Yu. Pleskov

Published based on the materials of the VII All-Russian Conference with International Participation “Fuel Cells and Power Plants Based on Them”, Chernogolovka, 2020.

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Ivanov, A.I., Bredikhin, S.I. & Kharton, V.V. Mixed Ionic-Electronic Conductivity of the Fluorite-Type Ce1 – x – yLaxPryO2 – δ Solid Solutions under Reducing Conditions. Russ J Electrochem 58, 122–130 (2022). https://doi.org/10.1134/S1023193522020045

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  • DOI: https://doi.org/10.1134/S1023193522020045

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