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Thermoelectric properties of A-site deficient La-doped SrTiO3 at 100-900 degrees C under reducing conditions
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 72020 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 40, no 2, p. 401-407Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2020. Vol. 40, no 2, p. 401-407
Keywords [en]
Thermoelectric properties, A-site deficient SrTiO3, Grain size, Figure-of-merit
National Category
Chemical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-176655DOI: 10.1016/j.jeurceramsoc.2019.09.024ISI: 000498292100026OAI: oai:DiVA.org:su-176655DiVA, id: diva2:1381319
Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2019-12-20Bibliographically approved

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