Preparation and Thermoelectric Properties of Bi Doped Ca3Co4O9 Based Thermoelectric Materials
| Autor: | Qin Chen, Jing Wang, Seok Je Lee, Chulg Yu Jhun, Xia Chun Zhu, Kyoung Woo Park |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science business.industry Mechanical Engineering Doping Spark plasma sintering 02 engineering and technology 021001 nanoscience & nanotechnology Thermoelectric materials 01 natural sciences Mechanics of Materials 0103 physical sciences Thermoelectric effect Optoelectronics General Materials Science 0210 nano-technology business |
| Zdroj: | Key Engineering Materials. 783:144-147 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.783.144 |
| Popis: | Polycrystalline Ca3-xBixCo4O9 samples have been prepared by solid-phase reaction followed by spark plasma sintering process. The thermoelectric properties have been systematically investigated from room temperature to near 1000K. It is found that the change of the carrier concentration leads to the change of resistivity, which is mainly associated with doping induced point defect phonon scattering. The change of the thermal potential mainly comes from the spin entropy. In addition, polycrystalline Ca3-xBixCo4O9 had a maximum figure of merit of 0.30 at 973 K, which was about 50% higher than Ca3Co4O9. It indicated that doping approach can effectively improve the thermoelectric performance of Ca3Co4O9+δ-based material. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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