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Preparation and thermoelectric properties of β-Fe1−xRuxSi2

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Abstract

β-Fe1−xRuxSi2 solid solution was synthesized by solid state reaction at 1100 °C for 48 h and subsequent annealing at 850 °C for 168 h in an evacuated silica tube. Single phase solid solution was obtained in the composition range 0 ≤ x ≤ 0.1. The thermal stability range of the β-phase is extended to higher temperature region by partial substitution of Ru atom. The thermoelectric properties of Cr or Co-doped β-Fe1−xRuxSi2 strongly depend on the sintering conditions. The samples with optimum thermoelectric properties are obtained by high-pressure sintering at 3 GPa and 800 °C for 1 h. The optimum compositions are found to be Fe0.92Ru0.05Cr0.03Si2 and Fe0.92Ru0.05C0.03Si2 for p-type and n-type materials, respectively. The power factors (σα2) of these materials are higher than that of β-FeSi2 based materials.

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Authors and Affiliations

  1. Department of Molecular Chemistry and Engineering, Faculty of Engineering, Tohoku University, Sendai, 980, Miyagi, Japan

    H. Takizawa, P. F. Mo, T. Endo & M. Shimada

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  1. H. Takizawa
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  2. P. F. Mo
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  3. T. Endo
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  4. M. Shimada
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Takizawa, H., Mo, P.F., Endo, T. et al. Preparation and thermoelectric properties of β-Fe1−xRuxSi2 . JOURNAL OF MATERIALS SCIENCE 30, 4199–4203 (1995). https://doi.org/10.1007/BF00360731

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  • DOI: https://doi.org/10.1007/BF00360731

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