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Effect of Cation Nonstoichiometry on the Properties of Solid Electrolyte Ba x Ce0.97Nd0.03O3 - δ (0.90 ≤ x ≤ 1.10)

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Abstract

The effect of the cation nonstoichiometry on the electroconduction, electrotransfer, and stability in humid air of solid proton-conducting electrolyte Ba x Ce0.97Nd0.03O3 - δ (0.90 ≤ x ≤ 1.10) is studied. The electroconduction is found to decrease with decreasing content of BaO (x ≤ 1.0) and weakly depend on the BaO excess (x> 1.0). Ceramics of a stoichiometric composition (x = 1) and with lack of barium is stable when stored in humid air at room temperature, as opposed to the ceramics with barium excess, which rapidly decomposes in these conditions. The conduction of materials under study in oxidizing environment is ion-hole and in reducing media, ionic (proton + oxygen). The cation nonstoichiometry barely affects the nature of the ion transfer. An analysis of possible models for the formation of defects shows oxygen vacancies to be always present in Ba x Ce0.97Nd0.03O3 - δ, even at the CeO2 excess exceeding the content of neodymium.

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Authors and Affiliations

  1. Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 20, Yekaterinburg, 620219, Russia

    N. V. Sharova & V. P. Gorelov

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  1. N. V. Sharova
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  2. V. P. Gorelov
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Sharova, N.V., Gorelov, V.P. Effect of Cation Nonstoichiometry on the Properties of Solid Electrolyte Ba x Ce0.97Nd0.03O3 - δ (0.90 ≤ x ≤ 1.10). Russian Journal of Electrochemistry 40, 639–645 (2004). https://doi.org/10.1023/B:RUEL.0000032014.73242.39

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  • DOI: https://doi.org/10.1023/B:RUEL.0000032014.73242.39

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