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Thermoelectric properties and texture evaluation of Ca3Co4O9 prepared by a cost-effective multisheet cofiring technique

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Abstract

Highly textured Ca3Co4O9 thermoelectrics were fabricated by a so-called multisheet cofiring (MSC) technique in combination with the commonly practiced spark plasma sintering (SPS) technique. X-ray diffraction analysis revealed that the MSC technique significantly enhances the degree of texture compared with the conventional SPS technique. This was confirmed by microstructure analysis performed on polished and chemically etched specimens. The power factor and the thermoelectric figure of merit for the specimen produced by the MSC technique were estimated to be ~5.2 × 10−4 W/mK2 and ~0.4, respectively, both of which are ~20% larger than those of the normally processed specimens. A comparative study of the thermoelectric properties, such as electrical resistivity and Seebeck coefficient, clearly demonstrated that texture mainly influences the electrical resistivity and consequently enhances the thermoelectric properties.

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Acknowledgements

This work was supported by the Mid-career Researcher Program of NRF/MEST (2010-0000463) in association with the Converging Research Center Program through the Ministry of Education, Science and Technology (2009-0093723) and the Core Technology of Materials Research and Development Program of the Korea Ministry of Intelligence and Economy (K00060071-55512).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744, Korea

    O-Jong Kwon, Kyeong-Eun Ko, Jae-Yeol Kim, Sung-Hwan Bae, Hyun Koo & Chan Park

  2. Institute of Materials Science, Technische Universität Darmstadt, 64287, Darmstadt, Germany

    Wook Jo

  3. Korea Institute of Ceramic Engineering and Technology, Seoul, 153-801, Korea

    Seong-Min Jeong

  4. Korea Institute of Science and Technology, Seoul, 136-791, Korea

    Jin-Sang Kim

  5. Research Institute of Advanced Materials, Seoul National University, Seoul, 151-744, Korea

    Chan Park

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  1. O-Jong Kwon
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  2. Wook Jo
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  9. Chan Park
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Correspondence to Chan Park.

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Kwon, OJ., Jo, W., Ko, KE. et al. Thermoelectric properties and texture evaluation of Ca3Co4O9 prepared by a cost-effective multisheet cofiring technique. J Mater Sci 46, 2887–2894 (2011). https://doi.org/10.1007/s10853-010-5163-3

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  • DOI: https://doi.org/10.1007/s10853-010-5163-3

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