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Thermoelectric power factor enhancement of textured ferroelectric SrxBa1-x Nb2O6-δ ceramics

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Abstract

A promising n-type thermoelectric oxide, based on the tungsten bronze-structured ferroelectric SrxBa1_xNb2O6-δ (SBN, x~0.61), was investigated to enhance the thermoelectric power factor through templated grain growth (textured poly crystalline). In the reduced SBN textured, both the electrical conductivity (σ) and the magnitude of thermopower (S) are increased in the c axis: σ33 > an and S33 > S11, and consequently, the thermoelectric power factor (PF) increased significantly due to crystal anisotropy and grain boundary density reduction. It was found in randomly oriented polycrystalline ceramics that the thermoelectric properties are dominated by a-axis properties. A ferroelectric-thermoelectric anomaly is observed at 4mm-4/mmm phase transition temperature (TC) and depends on temperature and reduction degree, consistent with our earlier observations in single crystal SBN. Above TC, the carrier transport mechanism is controlled by polaron hopping conduction, and below TC,the behavior depends on the degree of reduction. However, the magnitude of the Seebeck coefficient is dependent on the crystal anisotropy.

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Acknowledgments

This study is based on work supported by the National Science Foundation, as part of the Center for Dielectric Studies under Grant No. 0628817. The authors wish to acknowledge the Center for Dielectric Studies (CDS) membership and National Science Foundation Industry/University Cooperative Research Centers (NSFI/UCRC) program for support on this topic.

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Authors and Affiliations

  1. Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA

    Soonil Lee

  2. Department of Materials Science and Engineering, Gebze Institute of Technology, Gebze, Kocaeli, 41400, Turkey

    Sinan Dursun & Cihangir Duran

  3. Center for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA

    Clive A. Randall

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  1. Soonil Lee
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  2. Sinan Dursun
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  3. Cihangir Duran
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Correspondence to Soonil Lee.

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Lee, S., Dursun, S., Duran, C. et al. Thermoelectric power factor enhancement of textured ferroelectric SrxBa1-x Nb2O6-δ ceramics. Journal of Materials Research 26, 26–30 (2011). https://doi.org/10.1557/jmr.2010.78

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