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Preparation and electrical properties of sintered bodies composed of CrXMn1.5Co(1.0-X)Ni0.5O4 (0 ≦ X ≦ 0.42) with a cubic spinel structure

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Abstract

Preparation and electrical properties of sintered bodies consisting of monophase cubic spinel oxides, CrXMn1.5Co(1.0-X)Ni0.5O4 (0 ≦ X ≦ 0.42), were investigated. Specimens with compositions within X = 0.42 were prepared as starting materials. The element of Cr was used to exchange Co3+ in octahedral sites (B sites) with Cr3+ so that the hopping mechanism can be discussed. The sintered bodies with mono cubic spinel structure were confirmed to be prepared by heat-treatment for 48 h in air at 1000 °C to convert them into a cubic spinel structure after sintering at 1400 °C. The semiconductive characteristics of the sintered bodies were determined as p-type because the Seebeck coefficients were all positive. The electrical conduction of the sintered bodies was concluded to be controlled by the small polaron hopping mechanism. In the region 0.1 ≦ X ≦ 0.42, the lattice constant increases and electrical conduction (σ) decreases linearly with increasing Cr concentration. The decrease in σ and the increase in the lattice constant corresponded to the increase in Cr concentration by which the jumping distance of electrons between Mn3+ and Mn4+ is lengthened.

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Authors and Affiliations

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

    T. Yokoyama, A. Hirose, D. Ito, Y. Koshiba & S. Okazaki

  2. Graduate School of Environment and Information Science, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama-shi, 240-8501, Japan

    T. Meguro

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  1. T. Yokoyama
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  2. A. Hirose
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  3. T. Meguro
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Yokoyama, T., Hirose, A., Meguro, T. et al. Preparation and electrical properties of sintered bodies composed of CrXMn1.5Co(1.0-X)Ni0.5O4 (0 ≦ X ≦ 0.42) with a cubic spinel structure. J Electroceram 37, 1–7 (2016). https://doi.org/10.1007/s10832-015-9999-4

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  • DOI: https://doi.org/10.1007/s10832-015-9999-4

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