Enhancement of Thermoelectric Performance of Sr1−xTi0.8Nb0.2O3 Ceramics by Introducing Sr Vacancies
| Autor: | Yufei Chen, Chunlei Wang, Wenbin Su, Jichao Li, Xue-Jin Wang, Jian Liu, Xin-Miao Zhang, Yi Li |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Thermoelectric materials 01 natural sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Electrical resistivity and conductivity Seebeck coefficient Vacancy defect visual_art 0103 physical sciences Thermoelectric effect Materials Chemistry visual_art.visual_art_medium Strontium titanate Figure of merit Ceramic Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Electronic Materials. 48:1147-1152 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-018-6831-3 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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