Pressure-Induced Reversible Phase Transformation in Nanostructured Bi2Te3 with Reduced Transition Pressure

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• 作者：Guanjun Xiao ; Kai Wang ; Li Zhu ; Xiao Tan ; Yuancun Qiao ; Ke Yang ; Yanming Ma ; Bingbing Liu ; Weitao Zheng ; Bo Zou
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：February 19, 2015
• 年：2015
• 卷：119
• 期：7
• 页码：3843-3848
• 全文大小：327K
• ISSN：1932-7455

文摘

High-pressure research on nanostructured materials has been of considerable interest owing to the quantum confinement effect and intrinsic defects in the nanocrystals. Here, we report a pressure-induced reversible structural phase transition in nanostructured Bi₂Te₃ hierarchical architectures (HAs) that were prepared via a facile solution-phase method. Therein, distinct phases I鈥揑V by respectively adopting crystal structures of rhombohedral (I), monoclinic (II, III), and cubic (IV) were experimentally identified with increasing pressure up to 20.2 GPa in a diamond anvil cell (DAC). It is worthwhile to notice that nanostructured Bi₂Te₃ HAs ultimately evolved into a fascinating Bi鈥揟e substitutional nonmetallic alloy at pressure even as low as 15.0 GPa, approximately 10 GPa lower than that of the corresponding bulk counterpart. The synergistic effect involving large volume collapse and the unique one-dimensional nanostructures with intrinsic antisite defects was proposed to be responsible for the reduction of transition pressure that is contrary to the general model for most nanomaterials. Our findings may pave a potential pathway for developing future multifunctional nanoalloys that are composed of nonmetallic elements.