Abstract
Ceramics based on SrTiO3 are of growing interest as thermoelectric materials because of their high-temperature stability and non-toxicity. Substitution of La and Nb into the perovskite structure provides opportunities to control both the microstructure and properties. Ceramic solid solutions of (1 − x) SrTiO3 − (x) La1/3NbO3 were prepared by the mixed oxide route, using compositional steps of x = 0.1. Pressed pellets were sintered at temperatures of 1573 K to 1723 K in air. Addition of aliovalent ions (La3+, Nb5+) on the A/B sites (Sr2+, Ti4+) led to A-Site cation deficiency in the stoichiometric compositions and other defect structures which increased carrier concentration. A maximum ZT of 0.004 was obtained for the x = 0.2 stoichiometric sample, although much higher ZT values are possible by sample reduction.
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Acknowledgements
D.S. acknowledges support of a President’s Scholarship from the University of Manchester. The SuperSTEM facilities are supported by the EPSRC.
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Srivastava, D., Azough, F., Molinari, M. et al. High-Temperature Thermoelectric Properties of (1 − x) SrTiO3 − (x) La1/3NbO3 Ceramic Solid Solution. J. Electron. Mater. 44, 1803–1808 (2015). https://doi.org/10.1007/s11664-014-3560-0
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DOI: https://doi.org/10.1007/s11664-014-3560-0