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Enhanced thermoelectric properties of Sr0.9La0.1TiO3 ceramics fabricated by SPS with nanosized Ti addition

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Abstract

Sr0.9La0.1TiO3/20 wt%Ti ceramics with enhanced thermoelectric properties were prepared by spark plasma sintering (SPS) and nanosized Ti metal powders were used as additive. In the sintering process, a large proportion of Ti was oxidized, promoting the volatilization of lattice oxygen and creating more \(V_{{\text{O}}}^{ \cdot \cdot }\). Part of sintering aid Bi2O3 was reduced to metal Bi particles which facilitate carriers transport by forming an electron transport network. These two factors contribute to electrical resistivity reduction. The lowest electrical resistivity of ρ389K = 4.0 × 10–4 Ω cm and ρ1120K = 1.5 × 10–3 Ω cm and the maximum PF value PF389K = 1.08 mW/m/K2 were obtained. This work demonstrates that nanosized Ti addition together with Bi2O3 sintering aid in SPS process enhances the thermoelectric performance of Sr0.9La0.1TiO3.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51672219, 51702259), China-Poland International Collaboration Fund of National Natural Science Foundation of China (No. 51961135301), the Fundamental Research Funds for the Central Universities (Nos. 3102019GHJD001, 3102019MS0406), and the Basic Research Program of Shenzhen (No. JCYJ20170306155944271) and sponsored by Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (No. CX201827). We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for the measurements of SEM and EDS and valuable discussion.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Mengjie Qin, Zhihao Lou, Zongmo Shi, Jie Xu & Feng Gao

  2. School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK

    Ruizhi Zhang

  3. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, 518057, China

    Jie Xu

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  1. Mengjie Qin
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  2. Zhihao Lou
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  3. Zongmo Shi
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  4. Ruizhi Zhang
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Correspondence to Feng Gao.

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Qin, M., Lou, Z., Shi, Z. et al. Enhanced thermoelectric properties of Sr0.9La0.1TiO3 ceramics fabricated by SPS with nanosized Ti addition. J Mater Sci: Mater Electron 31, 6919–6926 (2020). https://doi.org/10.1007/s10854-020-03255-4

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  • DOI: https://doi.org/10.1007/s10854-020-03255-4

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