Effects of high pressure sintering on the microstructure and thermoelectric properties of BiCuSeO |
| |
| Authors: | Hongyu Zhu Yan Li Hongtao Li Taichao Su Chunying Pu Yongsheng Zhao |
| |
| Affiliation: | 1. State Key Lab of Superhard Materials, Jilin University, Changchun, People’s Republic of China;2. School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, People’s Republic of China;3. Technical Center for Industrial Product and Raw Material Inspection and Testing of SHCIQ, Shanghai, People’s Republic of China;4. School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, People’s Republic of China;5. College of Physics and Electronic Engineering, Nanyang Nomal University, Nanyang, People’s Republic of China |
| |
| Abstract: | Polycrystalline BiCuSeO oxides are prepared by solid-state reaction followed by pressureless sintering (PLS) and high pressure sintering (HPS) methods. Both the experimental results and the density functional theory calculations indicate that the crystal defect concentrations of BiCuSeO can be reduced under the effect of high pressure. By comparing with the PLS sample, a larger power factor and a lower thermal conductivity can be obtained for the HPS sample. The maximum figure of merit ZT～0.4 @ 800?K was obtained for the HPS sample, which is about 3 times higher than the PLS sample. These results indicate that the effect of high pressure is beneficial to modifying the microstructure and improving the thermoelectric performance of BiCuSeO oxyselenide. |
| |
| Keywords: | Thermoelectric high pressure BiCuSeO |
|
|
