Enhancement of Thermoelectric Performance of Sr1−xTi0.8Nb0.2O3 Ceramics by Introducing Sr Vacancies
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Donor-substituted strontium titanate is known as one of the best high-performance n-type oxide thermoelectric materials. In this work, Sr-deficient Sr1−xTi0.8Nb0.2O3 ceramics (x = 0, 0.01, 0.02, 0.03 and 0.04) were synthesized by solid state reaction, and the microstructural and thermoelectric properties were investigated to clarify the effects of Sr vacancies. By introducing Sr vacancies, the absolute Seebeck coefficient and electrical conductivity are enhanced simultaneously as compared with those of the sample without Sr vacancy, and thus the values of power factor are improved obviously. Although thermal conductivity increases after introducing Sr vacancies, thermoelectric performance of Sr1−xTi0.8Nb0.2O3 ceramic is enhanced notably because of the significantly enhanced power factor, and the figure of merit zT at 1073 K increases from 0.017 (of the sample x = 0) to 0.236 (of the sample x = 0.03).
KeywordsSrTiO3 ceramics thermoelectric properties Sr vacancies
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The authors acknowledge the financial support of the National Basic Research Program of China (Grant No. 2013CB632506) and National Natural Science Foundation of China (Grant Nos. 51202132, 11374186 and 51231007).
- 15.R. Liu, L.J. Gao, L.J. Li, S.J. Zhai, J.L. Wang, G.S. Fu, and S.F. Wang, Acta Phys. Sin. 64, 218101 (2015).Google Scholar