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<p>A successful method that can be utilized to convert thermal energy to electrical energy is thermoelectric energy conversion. Since the structuration at the nanoscale materials may improve the transport properties, we provide the thermoelectric characteristics of a nanostructured powder sample, Ba<sub>3</sub>Co<sub>2</sub>O<sub>6</sub>(CO<sub>3</sub>)<sub>0.6</sub> fabricated by the sol–gel method with a lesser annealing time. The thermoelectric properties, electrical conductivity, Seebeck coefficient, and power factor between 300 and 900&#xa0;K in air and thermal conductivity at room temperature were studied and connected to their phase compositions and microstructures. The increase of electrical conductivity with temperature affirms the semiconducting behavior of the synthesized sample and the positive Seebeck coefficient’s increase with temperature, maximum of 107μVK<sup>−1</sup> at 549&#xa0;K suggests the conduction mechanism with holes as charge carriers. Additionally, the calculated power factor values, though increasing with conductivity in the present case, are too low (1.3 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\times \)</EquationSource> </InlineEquation> 10<sup>–5</sup> Wm<sup>−1</sup>&#xa0;K<sup>−2</sup> at 746&#xa0;K) to be taken into consideration for real-world applications and it can be concluded that doping can enhance the thermoelectric characteristics of the sample. The figure of merit of the synthesized sample, Ba<sub>3</sub>Co<sub>2</sub>O<sub>6</sub>(CO<sub>3</sub>)<sub>0.6</sub> is found to be 6.8 × 10<sup>–8</sup>&#xa0;K<sup>−1</sup>, which is lesser than the earlier reported data and can become a potential thermoelectric material with a suitable doping strategy of Barium or Cobalt site. Keywords. Carrier concentration, Mobility, Seebeck coefficient, Grain boundary, Figure of merit</p>

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Thermoelectric Performance of Ba3Co2O6(CO3)0.6 Nanoparticle Synthesized by Sol–Gel Method

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Fareenpoornima Rafiq,
  • Magadevi Nirnal Kumar,
  • Papitha Purushothaman,
  • Parthipan Govindsamy

摘要

A successful method that can be utilized to convert thermal energy to electrical energy is thermoelectric energy conversion. Since the structuration at the nanoscale materials may improve the transport properties, we provide the thermoelectric characteristics of a nanostructured powder sample, Ba3Co2O6(CO3)0.6 fabricated by the sol–gel method with a lesser annealing time. The thermoelectric properties, electrical conductivity, Seebeck coefficient, and power factor between 300 and 900 K in air and thermal conductivity at room temperature were studied and connected to their phase compositions and microstructures. The increase of electrical conductivity with temperature affirms the semiconducting behavior of the synthesized sample and the positive Seebeck coefficient’s increase with temperature, maximum of 107μVK−1 at 549 K suggests the conduction mechanism with holes as charge carriers. Additionally, the calculated power factor values, though increasing with conductivity in the present case, are too low (1.3 \(\times \) 10–5 Wm−1 K−2 at 746 K) to be taken into consideration for real-world applications and it can be concluded that doping can enhance the thermoelectric characteristics of the sample. The figure of merit of the synthesized sample, Ba3Co2O6(CO3)0.6 is found to be 6.8 × 10–8 K−1, which is lesser than the earlier reported data and can become a potential thermoelectric material with a suitable doping strategy of Barium or Cobalt site. Keywords. Carrier concentration, Mobility, Seebeck coefficient, Grain boundary, Figure of merit