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<p>Thermoelectric (Bi<sub>1-x</sub>Sb<sub>x</sub>)<sub>2</sub>Te<sub>3</sub> (BST-x) compounds, with x=0.2, 0.7 and 0.9, have been studied using synchrotron angle-dispersive powder x-ray diffraction in a diamond anvil cell up to 25 GPa (at room temperature). The results clearly indicate that all compounds of this study follow a similar structural evolution like the one of pure Bi<sub>2</sub>Te<sub>3</sub> and Sb<sub>2</sub>Te<sub>3</sub> under pressure. From the comparison between the critical pressures of the corresponding phase transitions, a clear trend of increasing critical pressure for the transition to the disordered solid-solution BCC phase was observed with the increase of Sb concentration. In the case of the BST-0.7, an extended stability of the solid-solution BCC phase up to, at least, 180 GPa was observed. Finally, electrical transport properties measurements under pressure for BST-0.7, document a reversible pressure-induced metallization above 12 GPa.</p>

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Comparative high-pressure structural and electrical transport properties study of thermoelectric (Bi1­­­­­-xSbx)2Te3 compounds

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月21日

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  • Chenxin Wei,
  • Muhamed Dawod,
  • Wenting Lu,
  • Haikai Zou,
  • Baihong Sun,
  • Shiyu Feng,
  • Qian Zhang,
  • Zegeng Su,
  • Hirokazu Kadobayashi,
  • Martin Kunz,
  • Bihang Wang,
  • Azkar Saeed Ahmad,
  • Yaron Amouyal,
  • Elissaios Stavrou

摘要

Thermoelectric (Bi1-xSbx)2Te3 (BST-x) compounds, with x=0.2, 0.7 and 0.9, have been studied using synchrotron angle-dispersive powder x-ray diffraction in a diamond anvil cell up to 25 GPa (at room temperature). The results clearly indicate that all compounds of this study follow a similar structural evolution like the one of pure Bi2Te3 and Sb2Te3 under pressure. From the comparison between the critical pressures of the corresponding phase transitions, a clear trend of increasing critical pressure for the transition to the disordered solid-solution BCC phase was observed with the increase of Sb concentration. In the case of the BST-0.7, an extended stability of the solid-solution BCC phase up to, at least, 180 GPa was observed. Finally, electrical transport properties measurements under pressure for BST-0.7, document a reversible pressure-induced metallization above 12 GPa.