Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 2, Pages 401-407Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.09.024
Keywords
Thermoelectric properties; A-site deficient SrTiO3; Grain size; Figure-of-merit
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Funding
- Research Council of Norway under the program Nano2021 [228,854]
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Lanthanum doped strontium titanate is a potential n-type thermoelectric material at moderate and high temperatures. (La0.12Sr0.88)(0.95)TiO3 ceramics were prepared by two different routes, conventional sintering at 1500 degrees C and spark plasma sintering at temperatures between 925 and 1200 degrees C. Samples with grain size between 40 nm and 1.4 mu m were prepared and characterized with respect to their thermoelectric transport properties at temperatures between 100 and 900 degrees C under reducing conditions (H-2/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 degrees 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 degrees C for a grain size of 1.4 mu m. The highest figure-of-merit (zT) was measured for samples with 1.4 mu m average grain size reaching 0.2 at 500 degrees C.
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