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Drastic modification of low temperature thermoelectric properties of Na-doped Bi2Sr2Co2Oy ceramics prepared via laser floating zone technique

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Abstract

In this study, Bi2Sr2−xNaxCo2Oy (x = 0.0, 0.05, 0.075, 0.10, and 0.15) ceramic powders have been fabricated via the classical ceramic route, followed by a texturing process through the laser floating zone technique. XRD patterns show the thermoelectric phase as the major one. In addition, Na-substitution reduces the amount of secondary phases, when compared to the pure sample. SEM observations point out that grain orientation is significantly improved when Na-content is increased. Na-substitution reduces electrical resistivity from 35 (in pure samples) to 19.6 mΩ cm (in Na = 0.05 ones) at around room temperature, while Seebeck coefficient is, approximately, twice measured in Na-free. On the other hand, thermal conductivity is slightly lower in undoped samples (0.83 W/K m), when compared to the Na-substituted ones (1.10–1.40 W/K m) at room temperature, due to their lower electrical conductivity. Finally, ZT values are higher when the Na-content is increased, reaching 0.022 at around 400 K.

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Acknowledgements

This work is supported by Research Fund of Çukurova University, Adana, Turkey, under grant contracts no: FDK-2016-6105 and FBA-2019-12034. M. A. Madre and A. Sotelo wish to thank the Gobierno de Aragón-FEDER (Research Group T 54-17 R), and the Spanish MINECO-FEDER (MAT2017-82183-C3-1-R) for financial support. The use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza is also acknowledged.

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Authors and Affiliations

  1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, 01330, Adana, Turkey

    G. Çetin, B. Özçelik & M. Gürsul

  2. ICMA (CSIC-Universidad de Zaragoza), C/María de Luna 3, 50018, Zaragoza, Spain

    M. A. Madre & A. Sotelo

  3. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan

    S. Adachi & Y. Takano

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  1. G. Çetin
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Çetin, G., Özçelik, B., Gürsul, M. et al. Drastic modification of low temperature thermoelectric properties of Na-doped Bi2Sr2Co2Oy ceramics prepared via laser floating zone technique. J Mater Sci: Mater Electron 31, 15558–15564 (2020). https://doi.org/10.1007/s10854-020-04119-7

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