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Structural transition behavior of ZnS nanotetrapods under high pressure |
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| Authors: | Haofei Zhao Wei Liu Jie Zhu Xi Shen Lun Xiong Yanchun Li |
| Institution: | 1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China;2. Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education), Department of Physics, School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics, Beijing 100191, People's Republic of China;3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China |
| Abstract: | ZnS nanotetrapods synthesized via a solvothermal route have a octahedral core with a zincblende (ZB) structure and four hexprism-shaped arms consisting of alternately stacking ZB and wurtzite (WZ) phases, where the WZ phase has a higher volume percentage. In situ angular-dispersive X-ray diffraction (ADXRD) measurements were carried out to study the structural behavior of ZnS nanotetrapods under high pressure up to 41.3?GPa. The initial WZ structure exhibits a very high mechanical stability to ～11.3?GPa. Both the WZ and ZB structures transform to the rocksalt (RS) structure at ～15.4?GPa. The bulk moduli of the WZ (148.2?±?8.9?GPa) and RS (165.6?±?9.9?GPa) phases are both larger than the previously reported values. These phenomena are discussed based on the alternating epitaxial growth of the WZ and ZB phases in the arms of nanotetrapods. Our study suggests that the internal structure of nanomaterials could also greatly affect their stability and transition behavior. |
| Keywords: | ZnS nanotetrapods phase-transition behavior high pressure in situ ADXRD |