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<p>The marcasite-structured compound FeTe<sub>2</sub> exhibits certain thermoelectric characteristics, thereby positioning it as one of the promising thermoelectric materials whose performance remains subject to further optimization and enhancement. Bi<sub>2</sub>O<sub>3</sub> multiphase composite doped FeTe<sub>2</sub> bulk thermoelectric materials are prepared by hot-pressing sintering combined with high-temperature solid-state method. The results show that the synthesized samples have no obvious pores, and the densities are significantly increased to 7.28&#xa0;g·cm<sup>−3</sup>. The electrical properties of the samples are substantially improved by compounding different contents of Bi<sub>2</sub>O<sub>3</sub>. At the synthesis temperature of 923&#xa0;K, the sample Sb<sub>0.7</sub>FeTe<sub>2</sub>–15%Bi<sub>2</sub>O<sub>3</sub> achieves a maximum Seebeck coefficient of 171.38&#xa0;μV/K, while a maximum power factor of 1847.26&#xa0;μW/(m·K<sup>2</sup>) is obtained, which is nearly 30 times higher relative to the power factor of intrinsic FeTe<sub>2</sub>. The sample Sb<sub>0.7</sub>FeTe<sub>2</sub>–15%Bi<sub>2</sub>O<sub>3</sub> achieves a maximum <i>zT</i> value of 0.31 at a test temperature of 323&#xa0;K.</p>

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Effect on the microstructure and thermoelectric properties of Sb0.7FeTe2–x%Bi2O3 prepared by hot-pressing sintering

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Yonghua Ji,
  • Dan Zhao,
  • Lang Zhang,
  • Jiaxin Fan,
  • Renlin Zhu,
  • Run Huang,
  • Bingke Qin

摘要

The marcasite-structured compound FeTe2 exhibits certain thermoelectric characteristics, thereby positioning it as one of the promising thermoelectric materials whose performance remains subject to further optimization and enhancement. Bi2O3 multiphase composite doped FeTe2 bulk thermoelectric materials are prepared by hot-pressing sintering combined with high-temperature solid-state method. The results show that the synthesized samples have no obvious pores, and the densities are significantly increased to 7.28 g·cm−3. The electrical properties of the samples are substantially improved by compounding different contents of Bi2O3. At the synthesis temperature of 923 K, the sample Sb0.7FeTe2–15%Bi2O3 achieves a maximum Seebeck coefficient of 171.38 μV/K, while a maximum power factor of 1847.26 μW/(m·K2) is obtained, which is nearly 30 times higher relative to the power factor of intrinsic FeTe2. The sample Sb0.7FeTe2–15%Bi2O3 achieves a maximum zT value of 0.31 at a test temperature of 323 K.