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- Title
Optimization of mixed grain size structure for enhancement of thermoelectric figure of merit in p-type BiSbTe-based alloys.
- Authors
Dharmaiah, Peyala; Kim, Dae-Hyeon; Kwon, Jin-gu; Lee, Yeeun; Geum, Sangwon; Lee, Ga-ram; Kang, Minjae; Hong, Soon-Jik
- Abstract
A recent focus in thermoelectric research is to boost the thermoelectric figure of merit of existing materials through different approaches for energy conversion and cooling applications at room temperature. In this work, we have developed mixed-grain (coarse and fine) structured B0.5Sb1.5Te3 samples by combining water atomization, ball milling, and spark plasma sintering (SPS). It was observed that the grains in the mixed powder samples were well compacted and oriented randomly. However, there were pores on the surface of the grains that increased with the inclusion of fine particles. The mixed samples comprised coarse (submicron to several tens of microns) and fine grains (1.8 µm). It is found that the optimized mixed-grain structured (80C:20F) sample exhibited a synchronized enhancement of Seebeck coefficient and electrical conductivity due to the increased effective mass (m*) and carrier concentration. Consequently, the power factor (PF) increased to 4.2 × 10–3 W/mK2 at 300 K. The peak ZT of 1.16 at 350 K and average ZT of 1.12 in the range of 300–500 K were obtained for the optimized mixed-grain structured sample.
- Subjects
THERMOELECTRIC materials; THERMAL conductivity; GRAIN size; SEEBECK coefficient; CARRIER density; ENERGY conversion
- Publication
Journal of Materials Science, 2022, Vol 57, Issue 38, p18131
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-022-07532-x