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Research Article | Open Access

In-situ construction of all-scale hierarchical microstructure and thermoelectric properties of (Sr0.25Ca0.25Ba0.25La0.25)TiO3/Pb@Bi composite oxide ceramics

Ping Zhanga, Zhihao Loua, Guoxin Hub,( ), Zhuozhao Wuc, Jie Xua, Lingyun Gonga, Feng Gaoa( )
State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, NPU-QMUL Joint Research Institute of Advanced Materials and Structure, USI Institute of Intelligence Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China
Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi'an, 710072, China

Peer review under responsibility of The Chinese Ceramic Society.

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Graphical Abstract

Abstract

SrTiO3-based oxides have been investigated as a promising n-type thermoelectric material at high temperatures; however, the relatively high thermal conductivity results in inferior thermoelectric performance. The lattice thermal conductivity can be significantly reduced by high-entropy engineering via severe lattice distortion. However, high configuration entropy also causes the deterioration of carrier mobility and restrains electron transport resulting in low electrical conductivity. In this work, the low lattice thermal conductivity of 1.7 W/(m·K) at 1 073 K and significantly improved electrical conductivity of 112 S/cm from 60 S/cm can be achieved in n-type (Sr0.25Ca0.25Ba0.25La0.25)TiO3/Pb@Bi composites ceramics with core-shell grains of all-scale hierarchical microstructure. The effects of the complex microstructure of core-shell grains as well as the precipitated Pb@Bi particles on electrons and phonons transport properties were systematically explored. ZTmax of 0.18 was obtained for the SPS-1200, which was 1.5 times that of pure high-entropy (Ca0.2Sr0.2Ba0.2La0.2Pb0.2)TiO3 samples prepared by a solid-state method. This improvement in thermoelectric performance contributes to the addition of Bi2O3 into the high-entropy (Sr0.2Ca0.2Ba0.2Pb0.2La0.2)TiO3 matrix resulting in multiphase core-shell grain structure combined with well-dispersed nano-sized metal Pb@Bi precipitates in the matrix. This feasible strategy of in-situ constructing all-scale hierarchical nanostructures can also be applied to enhance the performance of other thermoelectric systems.

Keywords

Core-shellElectrical conductivityThermoelectricHigh-entropy

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Journal of Materiomics
Volume 9 Issue 4,
July 2023
Pages 661-672
DOI: 10.1016/j.jmat.2023.01.008
Cite this article:
Zhang P, Lou Z, Hu G, et al. In-situ construction of all-scale hierarchical microstructure and thermoelectric properties of (Sr0.25Ca0.25Ba0.25La0.25)TiO3/Pb@Bi composite oxide ceramics. Journal of Materiomics, 2023, 9(4): 661-672. https://doi.org/10.1016/j.jmat.2023.01.008

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Received: 29 October 2022
Revised: 26 December 2022
Accepted: 13 January 2023
Published: 15 February 2023
© 2023 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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