Grain orientation evolution and multi-scale interfaces enhanced thermoelectric properties of textured Sr0.9La0.1TiO3 based ceramics |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, USI Institute of Intelligence Materials and Structure, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Mianyang 621000, China;3. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China;4. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, United Kingdom;5. Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel;1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, Chengdu, China;3. National Engineering Research Center of Electromagnetic Radiation Control Materials, Chengdu, China;1. Beijing University of Technology, Beijing 100124, China;2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Peter Grünberg Institute, PGI-7 – Electronic Materials, Forschungszentrum Jülich GmbH & Jülich Aachen Research Alliance of Fundamentals on Future Information Technology (JARA-FIT), Jülich, Germany;2. Department of Materials Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan, ROC;3. Murata Manufacturing Co., Ltd., Kyoto, Japan;4. Institute of Energy and Climate Research, IEK-1 – Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, Jülich, Germany;5. Institut für Werkstoffe der Elektrotechnik II, RWTH Aachen, Aachen, Germany;1. CEITEC BUT, Brno University of Technology, Purkynova 123, Brno 61200, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, Brno 61669, Czech Republic |
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| Abstract: | Sr0.9La0.1TiO3 based textured ceramics (SLTT-S3T) with a texture fraction of 0.81 are successfully fabricated by the reactive template grain growth method, in which Sr0.9La0.1TiO3/20 wt%Ti was used as matrix and 10 wt% plate-like Sr3Ti2O7 template seeds were used as templates. The phase transition, microstructure evolution, and the anisotropic thermoelectric properties of SLTT-S3T ceramics were investigated. The results show that the ceramics are mainly composed of Sr0.9La0.1TiO3 and rutile TiO2 phases. Grains grow with a preferred orientation along (h00). A maximum ZT of 0.26 at 1073 K was achieved in the direction perpendicular to the tape casting direction. The low lattice thermal conductivity of 1.9 W/(m K) at 1073 K was obtained decreased by 34%, 40%, and 38% compared with non-textured, SrTiO3 and Sr0.9La0.1TiO3 ceramics prepared by the same process, can be attributed to the enhanced phonon scattering by the complex multi-scale boundaries and interfaces. This work provides a strategy of microstructural design for thermoelectric oxides to decrease intrinsic lattice thermal conductivity and further regulate thermoelectric properties via texture engineering. |
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| Keywords: | Strontium lanthanum titanate Textured ceramics Reactive templated grain growth Thermoelectric properties |
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