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Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100–900?°C under reducing conditions
Affiliation:1. Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491, Trondheim, Norway;2. Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349, Oslo, Norway;3. Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91, Stockholm, Sweden;1. Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, NO-7491 Trondheim, Norway;2. Department of Chemistry, Centre for Materials Science and Nanotechnology, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway;1. School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia;2. CSIRO, Clayton, Victoria 3168, Australia;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. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi''an, 710072, China;3. School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, United Kingdom
Abstract:Lanthanum doped strontium titanate is a potential n-type thermoelectric material at moderate and high temperatures. (La0.12Sr0.88)0.95TiO3 ceramics were prepared by two different routes, conventional sintering at 1500 °C and spark plasma sintering at temperatures between 925 and 1200 °C. Samples with grain size between 40 nm and 1.4 μm were prepared and characterized with respect to their thermoelectric transport properties at temperatures between 100 and 900 °C under reducing conditions (H2/H2O-buffer mixtures). The thermal conductivity was significantly reduced with decreasing grain size reaching a value of 1.3 W m?1. K?1 at 600 °C for grain size of 40 nm and porosity of 19%. Electrical conductivity increased with increasing grain size showing a maximum of 500 S cm?1 at 200 °C for a grain size of 1.4 μm. The highest figure-of-merit (zT) was measured for samples with 1.4 μm average grain size reaching 0.2 at 500 °C.
Keywords:Thermoelectric properties  Grain size  Figure-of-merit
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