Low-Temperature Transport Properties of Bi-Substituted β-As2Te3 Compounds

Journal of Electronic Materials volume 45, pages1786–1791(2016)Cite this article

Abstract

β-As2Te3 belongs to the family of Bi2Te3-based alloys, a well-known class of efficient thermoelectric materials around room temperature. As2Te3 exists in two allotropic configurations: α- and β-As2Te3, of which only the latter crystallizes in the same rhombohedral structure as Bi2Te3. Herein, we report on substitution of Bi for As in the As2−x Bi x Te3 system with x = 0.0, 0.015, 0.025, and 0.035. These samples have been characterized by x-ray diffraction and scanning electron microscopy. The transport properties have been measured at low temperatures (5 K to 300 K) in both directions, parallel and perpendicular to the pressing direction. The results are compared with those obtained in previous study on samples substituted by Sn. Compared with Sn, Bi allows for a clear decrease in electrical resistivity while maintaining the thermal conductivity below 1 W/(m K) over the whole temperature range. As a result, a comparable peak ZT value near 0.2 was obtained at room temperature.

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Affiliations

  1. Institut Jean Lamour (IJL), UMR 7198 CNRS, Université de Lorraine, Nancy, France

    J. -B. Vaney, C. Candolfi, A. Dauscher & B. Lenoir

  2. SPCTS, UMR CNRS 7315, Université de Limoges, Lyon, France

    J. -B. Vaney, J. Carreaud & G. Delaizir

  3. Institut de Chimie et des Matériaux de Paris Est (ICMPE), UMR 7182 CNRS, CMTR, Thiais, France

    C. Morin,  J. Monnier & E. Alleno

  4. Institut Charles Gerhardt (ICG), UMR 5253 CNRS, Université Montpellier 2, Montpellier, France

    A. Piarristeguy & A. Pradel

  5. C2TN Instituto Superior Técnico, Universidade Técnica de Lisboa, 2695-066, Bobadela LRS, Portugal

    A. P. Gonçalves & E. B. Lopes

Authors
  1. J. -B. Vaney
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  2. J. Carreaud
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  3. G. Delaizir
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  4. C. Morin
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  5. J. Monnier
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  6. E. Alleno
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  7. A. Piarristeguy
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  8. A. Pradel
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  9. A. P. Gonçalves
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  10. E. B. Lopes
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  11. C. Candolfi
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  12. A. Dauscher
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  13. B. Lenoir
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Correspondence to J. -B. Vaney.

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Vaney, J.-., Carreaud, J., Delaizir, G. et al. Low-Temperature Transport Properties of Bi-Substituted β-As2Te3 Compounds. Journal of Elec Materi 45, 1786–1791 (2016). https://doi.org/10.1007/s11664-015-4227-1

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Keywords

  • Thermoelectric materials
  • arsenic telluride
  • metastable thermoelectric phase