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Mn-Substitution Effect on Thermal Conductivity of Delafossite-Type Oxide CuFeO2

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Abstract

We have prepared the CuFe1−x Mn x O2 solid solution to enhance the thermoelectric performance of CuFeO2 by reducing its thermal conductivity κ. With increasing x above 0.4, the crystal structure changes from delafossite \( \left( {R\overline{3} m} \right) \) to crednerite (C2/m). CuFe0.5Mn0.5O2 exhibits the lowest κ value of 2.28 W/m K at the theoretical density, being about one-quarter of that of the end members, CuFeO2 and CuMnO2. We discuss the temperature dependence of κ in terms of a classical phonon transport model, and conclude that local structural modulation due to the mixture of undistorted FeO6 octahedra and distorted MnO6 octahedra in CuFe1−x Mn x O2 leads to the significant reduction of κ.

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Acknowledgements

This research was partially supported by a Grant-in-Aid for Scientific Research and for JSPS Fellows of the Ministry of Education, Science, Sports, and Culture.

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  1. Department of Applied Physics, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan

    T. Nozaki, K. Hayashi & T. Kajitani

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  1. T. Nozaki
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  2. K. Hayashi
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  3. T. Kajitani
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Correspondence to T. Nozaki.

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Nozaki, T., Hayashi, K. & Kajitani, T. Mn-Substitution Effect on Thermal Conductivity of Delafossite-Type Oxide CuFeO2 . J. Electron. Mater. 39, 1798–1802 (2010). https://doi.org/10.1007/s11664-010-1135-2

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  • DOI: https://doi.org/10.1007/s11664-010-1135-2

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