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Rare Metals

, Volume 37, Issue 4, pp 351–359 | Cite as

Optimization of thermoelectric properties of n-type Bi2(Te,Se)3 with optimizing ball milling time

  • Ji-Hee Son
  • Min-Wook Oh
  • Bong-Seo Kim
  • Su-Dong Park
Article

Abstract

The thermoelectric properties at elevated temperature were investigated for n-type Bi2(Te,Se)3 which is obtained from ball milling processed powder with various milling times. Electrical properties such as electrical resistivity and Seebeck coefficient are clearly dependent on milling time, in which the carrier concentration is attributed to the change of the electrical properties. The concentrations of the defects are also varied with the ball milling time, which is the origin of the carrier concentration variation. Even though finer grain sizes are obtained after the long ball milling time, the temperature dependence of the thermal conductivity is not solely understood with the grain size, whereas the electrical contribution to the thermal conductivity should be also considered. The highest figure of merit value of ZT = 0.83 is achieved at 373 K for the optimized samples, in which ball milling time is 10 h. The obtained ZT value is 48% improvement over that of the 0.5-h sample at 373 K.

Keywords

Thermoelectric properties Ball milling Bi2Te3 Seebeck coefficient Grain size Thermal conductivity 

Notes

Acknowledgements

This research was supported by the research fund of Hanbat National University in 2015.

Supplementary material

12598_2018_1028_MOESM1_ESM.docx (107 kb)
Supplementary material 1 (DOCX 107 kb)

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Thermoelectric Conversion Research CenterKorea Electrotechnology Research InstituteChangwonKorea
  2. 2.Department of Materials Science and EngineeringHanbat National UniversityDaejeonKorea

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