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Improvement in the thermoelectric properties of CaMnO3 perovskites by W doping

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Abstract

Perovskite manganites CaMn1−y W y O3 (0 ≤ y ≤ 0.05) were synthesized using solid-state reaction technique. The influence of W doping on the structure, charge carrier transports and phonon scattering of CaMnO3 was investigated. Doping was found to increase the carrier concentration, leading to enhanced electrical conductivity and decreased Seebeck coefficient. In addition, it decreased the thermal conductivity of CaMnO3, which was believed to associate with decreased phonon mean path and doping-induced MnO6 octahedral distortion, as evidenced by the increased orthorhombicity. A twofold increase of figure of merit (ZT) of 0.15 at 973 K was observed in CaMn0.99W0.01O3, compared with the undoped CaMnO3.

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Acknowledgements

The authors would like to thank the Australian Renewable Energy Agency (ARENA), Australian Research Council (ARC) and Baosteel for their financial support on this project.

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Authors and Affiliations

  1. School of Materials Science and Engineering, UNSW, Sydney, NSW, 2052, Australia

    Rezaul Kabir, Tianshu Zhang, Danyang Wang, Ruoming Tian, Thiam Teck Tan & Sean Li

  2. Division of Process Science and Technology, CSIRO, Clayton South, VIC, 3169, Australia

    Richard Donelson

Authors
  1. Rezaul Kabir
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  2. Tianshu Zhang
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  3. Danyang Wang
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  4. Richard Donelson
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  5. Ruoming Tian
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  6. Thiam Teck Tan
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  7. Sean Li
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Correspondence to Danyang Wang.

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Kabir, R., Zhang, T., Wang, D. et al. Improvement in the thermoelectric properties of CaMnO3 perovskites by W doping. J Mater Sci 49, 7522–7528 (2014). https://doi.org/10.1007/s10853-014-8459-x

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  • DOI: https://doi.org/10.1007/s10853-014-8459-x

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