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Journal of Electronic Materials

, Volume 48, Issue 1, pp 416–424 | Cite as

High Thermoelectric Figure of Merit in p-Type (Bi2Te3)x − (Sb2Te3)1−x Alloys Made from Element-Mechanical Alloying and Spark Plasma Sintering

  • Babu Madavali
  • Hyo-Seob Kim
  • Chul-Hee Lee
  • Dong-soo Kim
  • Soon-Jik Hong
Article
  • 29 Downloads

Abstract

p-Type (Bi2Te3)x − (Sb2Te3)1−x alloys with high thermoelectric properties were fabricated for waste heat energy recovery by mechanical alloying followed by spark plasma sintering. The samples’ diffraction peaks, such as the (015) positions, were slightly shifted from high to low 2θ angles with decreasing Sb2Te3 content due to the occupation of Sb sites by Bi atoms in the crystal lattice. The electrical conductivity increased with (Sb2Te3) content due to an increase in carrier concentration. The sample with the nominal composition of (Bi2Te3)0.15 + (Sb2Te3)0.85 exhibited a maximum thermoelectric figure of merit, ZT of 1.3 ± 0.06 at 400 K, and 1.07 ± 0.06 at 300 K. This enhanced ZT was successfully achieved by increasing (Sb2Te3) content, which reduces intrinsic conduction at higher temperatures by increasing carrier concentration and band gaps. The enhanced thermoelectric performance of the (Bi2Te3)0.15 + (Sb2Te3)0.85 TE materials can provide exceptional benefits for power generation and cooling applications around 400 K.

Keywords

Thermoelectric materials p-type Bi-Sb-Te alloys mechanical alloying thermoelectric properties 

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Notes

Acknowledgments

This work was supported by ‘Energy Efficiency & Resources Core Technology Program’ of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (20152020001210). Part of this work also supported by the National Research Council of Science & Technology (NST) Grant by the Korea Government (MSIP) (No. CRC-15-06-KIGAM).

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Babu Madavali
    • 1
  • Hyo-Seob Kim
    • 2
  • Chul-Hee Lee
    • 1
  • Dong-soo Kim
    • 3
  • Soon-Jik Hong
    • 1
  1. 1.Division of Advanced Materials Engineering and Institute for Rare MetalsKongju National UniversityCheonanRepublic of Korea
  2. 2.Liquid Processing and Casting Technology, R&D GroupKorea Institute of Industrial TechnologyIncheonRepublic of Korea
  3. 3.Powder and Ceramics DivisionKorea Institute of Materials ScienceChangwonRepublic of Korea

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