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Transport Properties of Ca1 – x MnO3 – δ + xCeO2(0 < x ≤ 0.15) Mixtures

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Abstract

Data are presented on the temperature-dependent electrical conductivity and thermoelectric power of Ca1 – x MnO3 – δ + xCeO2 (0 < x ≤ 0.15) mixtures obtained as intermediate products in the synthesis of Ca1 – x Ce x MnO3 – δ solid solutions. The electrical properties of the mixtures are shown to be dominated by those of the perovskite-like phase Ca1 – x MnO3 – δ and to depend on Ca concentration. All of the samples with 0 ≤ x ≤ 0.15 exhibit n-type conductivity. The charge transport in CaMnO3 – δ below 930 K is attributable to small-polaron hopping. At higher temperatures, conduction through delocalized states seems to prevail. In the Ca1 – x MnO3 – δ + xCeO2 mixtures with 0.05 ≤ x ≤ 0.15, small-polaron hopping is observed between 160 and 920 K. Below 160 K, the temperature variation of conductivity in the samples with x = 0.1 and 0.15 follows Mott's law.

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

    S. I. Vecherskii, M. A. Konopel'ko, N. O. Esina & N. N. Batalov

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  1. S. I. Vecherskii
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  2. M. A. Konopel'ko
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  3. N. O. Esina
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  4. N. N. Batalov
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Vecherskii, S.I., Konopel'ko, M.A., Esina, N.O. et al. Transport Properties of Ca1 – x MnO3 – δ + xCeO2(0 < x ≤ 0.15) Mixtures. Inorganic Materials 38, 1270–1276 (2002). https://doi.org/10.1023/A:1021379606219

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