Abstract
In this work, we prepare Ca2+ and Ba2+ co−doped BiCuSeO using a solid−state reaction, followed by spark plasma sintering. Ca2+/Ba2+ co−doping significantly increases the electrical conductivity through the increased hole concentration. In addition to the increased power factor, Ca2+/Ba2+ co−doping reduces the phonon thermal conductivity through grain refinement, increased porosity, and mass and strain field fluctuations. The combination of the largest power factor and the low phonon thermal conductivity for Bi0.80Ca0.10Ba0.10CuSeO yields the largest dimensionless figure−of−merit (ZT). The ZT of Bi0.80Ca0.10Ba0.10CuSeO (0.60) at 600 °C is two times larger than that of the undoped BiCuSeO (0.30) at 600 °C. We systematically discuss the effect of the Ca2+/Ba2+ co−doping on the thermoelectric properties of BiCuSeO oxyselenide.
Original language | English |
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Article number | 159969 |
Journal | Journal of Alloys and Compounds |
Volume | 876 |
DOIs | |
Publication status | Published - 2021 Sept 25 |
Externally published | Yes |
Keywords
- Crystal structure
- Electrical transport
- Oxide materials
- Sintering
- Thermoelectric
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry