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Low-temperature thermoelectric characteristics of Ca3−xYbxCo3.95Ga0.05O9+δ (0 ≤ x ≤ 0.10)

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Abstract

Polycrystalline samples of Ca3−xYbxCo3.95Ga0.05O9+δ (x = 0.00, 0.02, 0.05 and 0.10) have been prepared by conventional solid-state synthesis. The XRD results revealed that all the samples are single phase. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity, thermopower increased and total thermal conductivity decreased with increasing Yb3+ content. Ca2.95Yb0.05Co3.95Ga0.05O9+δ had the highest dimensionless figure of merit of 0.035 at 300 K, which is about 34.6 % higher than that of the undoped sample. These results suggested that the partial substitution of Yb3+ ion improves the thermoelectric properties of Ca3Co4O9+δ.

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Acknowledgments

This work was supported by National Science Council of Republic of China, Taiwan under the Grant No. 101-2112-M-018-003-MY3. Ankam Bhaskar would like to express thanks to the postdoctoral fellowship sponsored by NSC of Taiwan.

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Authors and Affiliations

  1. Department of Physics, National Changhua University of Education, Changhua, 500, Taiwan

    Ankam Bhaskar, Y.-C. Huang & Chia-Jyi Liu

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  1. Ankam Bhaskar
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  2. Y.-C. Huang
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  3. Chia-Jyi Liu
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Correspondence to Chia-Jyi Liu.

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Bhaskar, A., Huang, YC. & Liu, CJ. Low-temperature thermoelectric characteristics of Ca3−xYbxCo3.95Ga0.05O9+δ (0 ≤ x ≤ 0.10). J Mater Sci: Mater Electron 25, 249–254 (2014). https://doi.org/10.1007/s10854-013-1579-2

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