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High-temperature thermoelectric properties of Ca0.9Y0.1Mn1−x Fe x O3 (0 ≤ x ≤ 0.25)

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Abstract

Polycrystalline compounds of Ca0.9Y0.1Mn1− x Fe x O3 for 0 ≤ x ≤ 0.25 were prepared by solid-state reaction, followed by spark plasma sintering process, and their thermoelectric properties from 300 to 1200 K were systematically investigated in terms of Y and Fe co-doping at the Ca- and Mn-sites, respectively. Crystal structure refinement revealed that all the investigated samples have the O′-type orthorhombic structure, and the lattice parameters slightly increased with increasing Fe concentration, causing a crystal distortion. It was found that with increasing the content of Fe doping, the Seebeck coefficient of Ca0.9Y0.1Mn1− x Fe x O3 tended to increase, while the tendency toward the electrical conductivity was more complicated. The highest power factor was found to be 2.1 × 10−4 W/mK2 at 1150 K for the sample with x = 0.05 after annealing at 1523 K for 24 h in air. Thermal conductivity of the Fe-doped samples showed a lower value than that of the x = 0 sample, and the highest dimensionless figure of merit, ZT was found to be improved about 20 % for the sample with x = 0.05 as compared to that of the x = 0 sample at 1150 K.

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Acknowledgements

The authors would like to thank the Programme Commission on Energy and Environment (EnMi) which is part of the Danish Council for Strategic Research (Contract No. 10-093971) for sponsoring this work via the OTE-POWER research work.

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Authors and Affiliations

  1. Department of Energy Conversion and Storage, Technical University of Denmark, DTU Risø Campus, 4000, Roskilde, Denmark

    Le Thanh Hung, Ngo Van Nong, Li Han, Nini Pryds & Søren Linderoth

  2. Solid State Department, Faculty of Physics, Hanoi University of Science, Vietnam National University of Hanoi, Hanoi, Vietnam

    Dang Le Minh

  3. Centre for Materials Crystallography, Department of Chemistry and iNANO, University of Aarhus, 8000, Aarhus C, Denmark

    Kasper A. Borup & Bo B. Iversen

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  1. Le Thanh Hung
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  2. Ngo Van Nong
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  3. Li Han
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  5. Kasper A. Borup
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  7. Nini Pryds
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  8. Søren Linderoth
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Correspondence to Le Thanh Hung.

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Hung, L.T., Nong, N.V., Han, L. et al. High-temperature thermoelectric properties of Ca0.9Y0.1Mn1−x Fe x O3 (0 ≤ x ≤ 0.25). J Mater Sci 48, 2817–2822 (2013). https://doi.org/10.1007/s10853-012-6834-z

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  • DOI: https://doi.org/10.1007/s10853-012-6834-z

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