Pressure-Induced Disordered Substitution Alloy in Sb2Te3

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• 作者：Jinggeng Zhao ; Haozhe Liu ; Lars Ehm ; Zhiqiang Chen ; Stanislav Sinogeikin ; Yusheng Zhao ; Genda Gu
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：November 21, 2011
• 年：2011
• 卷：50
• 期：22
• 页码：11291-11293
• 全文大小：204K
• 年卷期：v.50,no.22(November 21, 2011)
• ISSN：1520-510X

文摘

A new type of disordered substitution alloy of Sb and Te at above 15.1 GPa was discovered by performing in situ high-pressure angle-dispersive X-ray diffraction experiments on antimony telluride (Sb₂Te₃), a topological insulator and thermoelectric material, at room temperature. In this disordered substitution alloy, Sb₂Te₃ crystallizes into a monoclinic structure with the space group C2/m, which is different from the corresponding high-pressure phase of the similar isostructural compound Bi₂Te₃. Above 19.8 GPa, Sb₂Te₃ adopts a body-centered-cubic structure with the disordered atomic array in the crystal lattice. The in situ high-pressure experiments down to about 13 K show that Sb₂Te₃ undergoes the same phase-transition sequence with increasing pressure at low temperature, with almost the same phase-transition pressures.