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Synthesis of SrTiO3 Fibers and Their Effects on the Thermoelectric Properties of La0.1Dy0.1Sr0.75TiO3 Ceramics

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Abstract

SrTiO3 fibers were fabricated by an in situ hydrothermal method using hydrated TiO2 fibers as both template and reactant. La0.1Dy0.1Sr0.75TiO3 powders containing x wt.% SrTiO3 fibers (x = 0, 1, 3, 5) were prepared by the sol–gel method and then sintered at 1450 °C under a reducing atmosphere (N2/H2 = 95/5). XRD analysis showed that the samples were mainly composed of SrTiO3 phase and a few Dy2Ti2O7 phase. TiO2 phase was detected in the samples with x = 3 and x = 5, and its peak intensity clearly reinforced with increasing x. With the addition of SrTiO3 fibers, the electrical conductivity increased significantly and the Seebeck coefficient kept almost unchanged, resulting in a high power factor of 1015 μW m−1 K−2 at 200 °C with a loading of 3 wt.% SrTiO3 fibers. Meanwhile, combined with low thermal conductivity, the sample with 3 wt.% SrTiO3 fibers showed the peak ZT value of 0.19 at 500 °C, which was 127% higher than that of La0.1Dy0.1Sr0.75TiO3.

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Acknowledgements

The authors would like to thank the financial supports from Shandong Natural Science Foundation Project (Grant No. ZR2015EM013).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming, 650106, People’s Republic of China

    Jiao Han & YiMing Zeng

  2. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Jiao Han & Ying Song

  3. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, People’s Republic of China

    HongQuan Liu

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  1. Jiao Han
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Correspondence to Ying Song or HongQuan Liu.

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Han, J., Zeng, Y., Song, Y. et al. Synthesis of SrTiO3 Fibers and Their Effects on the Thermoelectric Properties of La0.1Dy0.1Sr0.75TiO3 Ceramics. Electron. Mater. Lett. 15, 278–286 (2019). https://doi.org/10.1007/s13391-018-00113-8

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