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<p>Thermoelectric materials can convert thermal energy into electricity, and their performance at an operating temperature <i>T</i> is estimated by the dimensionless figure of merit, <i>ZT</i>. BiCuChO (Ch: S, Se, or Te), an oxychalcogenide compound, is a promising material with low thermal conductivity owing to its layered structure. Co-doping with Pb and Ca at the Bi site in BiCuSeO has been effective in decreasing the electrical resistivity, leading to an increase in <i>ZT</i>. In this study, a similar doping strategy was applied to BiCuSO, which has the same crystal structure but lower cost and more earth abundance. Bi<sub>1−2<i>x</i></sub>Pb<sub><i>x</i></sub>Ca<sub><i>x</i></sub>CuSO (0 ≤ <i>x</i> ≤ 0.02) was synthesized using a polymerized complex method followed by a solid-state reaction method. By co-doping with Pb and Ca, an increase in the Seebeck coefficient and a decrease in the electrical resistivity and thermal conductivity of BiCuSO were observed. As a result, a maximum <i>ZT</i> of 0.22 was obtained for Bi<sub>1−2<i>x</i></sub>Pb<sub><i>x</i></sub>Ca<sub><i>x</i></sub>CuSO (<i>x</i> = 0.02) at 773 K, which is much larger than the maximum value of 0.14 reported for BiCuSO.</p>

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Bi1−2xPbxCaxCuSO Synthesized Using Polymerized Complex and Solid-State Reaction Methods for Thermoelectric Evaluation

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Miqdad Al Muflih,
  • Shigeru Katsuyama,
  • Takeshi Yoshikawa

摘要

Thermoelectric materials can convert thermal energy into electricity, and their performance at an operating temperature T is estimated by the dimensionless figure of merit, ZT. BiCuChO (Ch: S, Se, or Te), an oxychalcogenide compound, is a promising material with low thermal conductivity owing to its layered structure. Co-doping with Pb and Ca at the Bi site in BiCuSeO has been effective in decreasing the electrical resistivity, leading to an increase in ZT. In this study, a similar doping strategy was applied to BiCuSO, which has the same crystal structure but lower cost and more earth abundance. Bi1−2xPbxCaxCuSO (0 ≤ x ≤ 0.02) was synthesized using a polymerized complex method followed by a solid-state reaction method. By co-doping with Pb and Ca, an increase in the Seebeck coefficient and a decrease in the electrical resistivity and thermal conductivity of BiCuSO were observed. As a result, a maximum ZT of 0.22 was obtained for Bi1−2xPbxCaxCuSO (x = 0.02) at 773 K, which is much larger than the maximum value of 0.14 reported for BiCuSO.