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Thermoelectric Properties of Alumina-Doped Bi 0.4 Sb 1.6 Te 3 Nanocomposites Prepared through Mechanical Alloying and Vacuum Hot Pressing

Author

Listed:
  • Chung-Kwei Lin

    (School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan)

  • May-Show Chen

    (School of Oral Hygiene, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan
    Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan)

  • Rong-Tan Huang

    (Institute of Materials Engineering, National Taiwan Ocean University, Keelung 202, Taiwan)

  • Yu-Chun Cheng

    (Institute of Materials Engineering, National Taiwan Ocean University, Keelung 202, Taiwan)

  • Pee-Yew Lee

    (Institute of Materials Engineering, National Taiwan Ocean University, Keelung 202, Taiwan)

Abstract

In this study, γ-Al 2 O 3 particles were dispersed in p -type Bi 0.4 Sb 1.6 Te 3 through mechanical alloying to form γ-Al 2 O 3 /Bi 0.4 Sb 1.6 Te 3 composite powders. The composite powders were consolidated using vacuum hot pressing to produce nano- and microstructured composites. Thermoelectric (TE) measurements indicated that adding an optimal amount of γ-Al 2 O 3 nanoparticles improves the TE performance of the fabricated composites. High TE performances with figure of merit (ZT) values as high as 1.22 and 1.21 were achieved at 373 and 398 K for samples containing 1 and 3 wt % γ-Al 2 O 3 nanoparticles, respectively. These ZT values are higher than those of monolithic Bi 0.4 Sb 1.6 Te 3 samples. The ZT values of the fabricated samples at 298–423 K are 1.0–1.22; these ZT characteristics make γ-Al 2 O 3 /Bi 0.4 Sb 1.6 Te 3 composites suitable for power generation applications because no other material with a similarly high ZT value has been reported at this temperature range. The achieved high ZT value may be attributable to the unique nano- and microstructures in which γ-Al 2 O 3 nanoparticles are dispersed among the grain boundary or in the matrix grain, as revealed by high-resolution transmission electron microscopy. The dispersed γ-Al 2 O 3 nanoparticles thus increase phonon scattering sites and reduce thermal conductivity. The results indicated that the nano- and microstructured γ-Al 2 O 3 /Bi 0.4 Sb 1.6 Te 3 alloy can serve as a high-performance material for application in TE devices.

Suggested Citation

  • Chung-Kwei Lin & May-Show Chen & Rong-Tan Huang & Yu-Chun Cheng & Pee-Yew Lee, 2015. "Thermoelectric Properties of Alumina-Doped Bi 0.4 Sb 1.6 Te 3 Nanocomposites Prepared through Mechanical Alloying and Vacuum Hot Pressing," Energies, MDPI, vol. 8(11), pages 1-11, November.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:11:p:12323-12583:d:58411
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    Citations

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    Cited by:

    1. Ravi Anant Kishore & Roop L. Mahajan & Shashank Priya, 2018. "Combinatory Finite Element and Artificial Neural Network Model for Predicting Performance of Thermoelectric Generator," Energies, MDPI, vol. 11(9), pages 1-17, August.
    2. Fitriani, & Ovik, R. & Long, B.D. & Barma, M.C. & Riaz, M. & Sabri, M.F.M. & Said, S.M. & Saidur, R., 2016. "A review on nanostructures of high-temperature thermoelectric materials for waste heat recovery," Renewable and Sustainable Energy Reviews, Elsevier, vol. 64(C), pages 635-659.

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