CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Reexploration of Structural Changes in Element Bromine through Pressure-Induced Decomposition of Solid HBr |
Ming-Kun Liu, De-Fang Duan, Yan-Ping Huang, Yong-Fu Liang, Xiao-Li Huang**, Tian Cui** |
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012
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Cite this article: |
Ming-Kun Liu, De-Fang Duan, Yan-Ping Huang et al 2019 Chin. Phys. Lett. 36 086401 |
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Abstract Simple molecular solids have been an important subject in condensed matter physics, particularly for research of pressure-induced molecular dissociation. We re-explore the structural changes of element bromine through pressure-induced decomposition of solid HBr. The phase changes in HBr are investigated by Raman spectroscopy and synchrotron x-ray diffraction up to 125 GPa at room temperature. By applying pressure, HBr decomposes into solid bromine in the pressure range of 18.7–38 GPa. The solid bromine changes from molecular phase to incommensurate phase at 81 GPa, and finally to monatomic phase at 91 GPa. During the process of pressure-induced molecular dissociation, the intermediate incommensurate phase of element bromine is confirmed for the first time from the x-ray diffraction studies. The decomposition of HBr is irreversible since HBr cannot form again upon pressure decompression.
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Received: 01 July 2019
Published: 22 July 2019
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PACS: |
64.60.-i
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(General studies of phase transitions)
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62.50.-p
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(High-pressure effects in solids and liquids)
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64.70.Rh
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(Commensurate-incommensurate transitions)
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91.60.Hg
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(Phase changes)
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Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51572108, 51632002, 11504127, 11674122, 11574112, 11474127 and 11634004, the 111 Project (No B12011), Program for Changjiang Scholars and Innovative Research Team in University (No IRT-15R23), and the National Fund for Fostering Talents of Basic Science (No J1103202). |
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