Enhanced Thermoelectric Properties in BiCuSeO Oxyselenides via Zn and S Dual-Site Substitution
| Autor: | Cencen Zhang, Chengming Cao, Jianxin Fu, L.M. Peng, Yazhou Sun |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Analytical chemistry Sintering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Thermoelectric materials Microstructure 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Thermal conductivity Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect Materials Chemistry Thermal stability Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Electronic Materials. 46:5909-5915 |
| ISSN: | 1543-186X 0361-5235 |
| Popis: | We report on the effect of Zn and S dual-site substitution on the thermoelectric properties of Bi1−x Zn x CuSeO1−x S x (x = 0, 0.025, 0.05, 0.075) oxyselenides prepared by conventional two-step solid-state reaction followed by inductive hot-pressing sintering. BiCuSeO phase with lath-like microstructures was observed for all samples. Upon Zn and S dual-site substitution, the electrical conductivity at 750 K was improved from 28.9 S cm−1 for pure BiCuSeO to 43.3 S cm−1 for Bi0.975Zn0.025CuSeO0.975S0.025 with highest Seebeck coefficient of 360 μV K−1 for Bi0.95Zn0.05CuSeO0.95S0.05. A maximum power factor of 4.6 μW cm−1 K−2 was achieved for Bi0.95Zn0.05CuSeO0.95S0.05 at 750 K due to its moderate electrical conductivity and high Seebeck coefficient. As the enhanced power factor compensates for the slight increase in the total thermal conductivity, the dimensionless figure of merit ZT reached a maximum value of 0.68 for Bi0.95Zn0.05CuSeO0.95S0.05 at 750 K, approximately 1.7 times larger than that of pristine BiCuSeO. |
| Databáze: | OpenAIRE |
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