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<p>We report a thermoelectric study of beta-phase zinc antimony alloy (β–Zn<sub>4</sub>Sb<sub>3</sub>) powders, which were synthesized using a solid-state reaction and argon calcination, with optimal conditions at 12 at.% excess Zn. X-ray diffraction confirmed high-purity β–Zn<sub>4</sub>Sb<sub>3</sub> with minimal secondary phases. Furthermore, x-ray absorption near-edge spectroscopy analysis indicated that the synthesized β–Zn<sub>4</sub>Sb<sub>3</sub> powders were fully alloyed. The sintered pellets showed notable thermoelectric properties: a Seebeck coefficient of 255&#xa0;<i>μ</i>V/°C, an electrical conductivity of 8&#xa0;×&#xa0;10<sup>5</sup> Ω⁻<sup>1</sup>&#xa0;m⁻<sup>1</sup> at 320°C, power factor of approximately 0.56 mW/m°C<sup>2</sup> between 220°C and 240°C, thermal conductivity of approximately 0.74 W/m°C between 60°C and 150°C then a decrease to 0.33 W/m°C between 220 and 400°C, the maximum figure-of-merit (ZT) of 1.1 at approximately 300°C. Monolithic thermoelectric generator (TEG) modules were created by stacking β–Zn<sub>4</sub>Sb<sub>3</sub> pellets with insulating ZnO pellets, resulting in a 2 cm ×&#xa0;1 cm&#xa0;×&#xa0;1&#xa0;cm module that exhibited an open-circuit voltage of 73.1&#xa0;mV and a maximum power output of 550&#xa0;<i>μ</i>W at a hot-side operating temperature of 300°C with a 100°C gradient. The TEG modules made from beta-phase zinc antimony alloy present a promising solution for industrial waste heat applications. However, there are some gaps in the analysis and presentation of the results.</p>

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Fabrication and Performance of Monolithic β–Zn4Sb3/ZnO Thermoelectric Generator Module

  • 期刊论文

  • 发表日期：

    2025年3月26日

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  • Tachgiss Jampreecha,
  • Anuchit Sawangprom,
  • Narong Chanlek,
  • Supree Pinitsoontorn,
  • Worawat Meevasana,
  • Santi Maensiri

摘要

We report a thermoelectric study of beta-phase zinc antimony alloy (β–Zn4Sb3) powders, which were synthesized using a solid-state reaction and argon calcination, with optimal conditions at 12 at.% excess Zn. X-ray diffraction confirmed high-purity β–Zn4Sb3 with minimal secondary phases. Furthermore, x-ray absorption near-edge spectroscopy analysis indicated that the synthesized β–Zn4Sb3 powders were fully alloyed. The sintered pellets showed notable thermoelectric properties: a Seebeck coefficient of 255 μV/°C, an electrical conductivity of 8 × 105 Ω⁻1 m⁻1 at 320°C, power factor of approximately 0.56 mW/m°C2 between 220°C and 240°C, thermal conductivity of approximately 0.74 W/m°C between 60°C and 150°C then a decrease to 0.33 W/m°C between 220 and 400°C, the maximum figure-of-merit (ZT) of 1.1 at approximately 300°C. Monolithic thermoelectric generator (TEG) modules were created by stacking β–Zn4Sb3 pellets with insulating ZnO pellets, resulting in a 2 cm × 1 cm × 1 cm module that exhibited an open-circuit voltage of 73.1 mV and a maximum power output of 550 μW at a hot-side operating temperature of 300°C with a 100°C gradient. The TEG modules made from beta-phase zinc antimony alloy present a promising solution for industrial waste heat applications. However, there are some gaps in the analysis and presentation of the results.