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Preparation and electrical properties of sintered oxides composed of Mn1.5Co(0.25+X)Ni(1.25-X)O4 ( \(0 \leqq X \leqq 0.75\)) with a cubic spinel structure

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Abstract

Monophase cubic spinel-type oxides of Mn1.5Co(0.25+X)Ni(1.25-X)O4 ( \(0 \leqq X \leqq 1\)) were prepared through the oxidation of specimens sintered at 1400 °C. The oxides with \( 0 \leqq X \leqq 0.75 \) composition are focused on in this study, as the oxides with \( 0.75 < X \leqq 1 \) composition did not convert into a monophase cubic spinel structure. The electrical conductivity of the sintered bodies was confirmed to increase exponentially with increasing temperature. In the composition range of \(0 \leqq X \leqq 0.75\), both the electrical conductivity and the Seebeck coefficient increased with increasing X. The oxides with composition between \(0 \leqq X < 0.57\) were n-type semiconductors, whereas those with \( 0.57 < X \leqq 0.75 \) were p-type. It was concluded that electrical conduction in the specimens is controlled by small polaron hopping.

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Authors and Affiliations

  1. Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, 240-8501, Japan

    T. Yokoyama, T. Meguro, Y. Shimada, J. Tatami & K. Komeya

  2. Technol Seven Co. Ltd., 25-6 Tobehonmachi, Nishi-ku, Yokohama-shi, 226-0041, Japan

    Y. Abe

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  1. T. Yokoyama
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  2. T. Meguro
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  3. Y. Shimada
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  4. J. Tatami
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  5. K. Komeya
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  6. Y. Abe
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Correspondence to T. Yokoyama.

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Yokoyama, T., Meguro, T., Shimada, Y. et al. Preparation and electrical properties of sintered oxides composed of Mn1.5Co(0.25+X)Ni(1.25-X)O4 ( \(0 \leqq X \leqq 0.75\)) with a cubic spinel structure. J Mater Sci 42, 5860–5866 (2007). https://doi.org/10.1007/s10853-006-1141-1

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  • DOI: https://doi.org/10.1007/s10853-006-1141-1

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