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arXiv · 2503.06562

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

Chenxin Wei·Dawod Muhamed·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
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Abstract

Thermoelectric (Bi1-x Sbx)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 with 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.

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Chenxin Wei, Dawod Muhamed, 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. 2025-03-09. Comparative high-pressure structural and electrical transport properties study of thermoelectric (Bi1-xSbx)2Te3 compounds. https://arxiv.org/abs/2503.06562

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