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High-pressure Raman study of solid hydrogen up to 300 GPa |
| Xiaoli Huang(黄晓丽), Fangfei Li(李芳菲), Yanping Huang(黄艳萍), Gang Wu(吴刚), Xin Li(李鑫), Qiang Zhou(周强), Bingbing Liu(刘冰冰), Tian Cui(崔田) |
| State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China |
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Abstract The high-pressure behavior of solid hydrogen has been investigated by in situ Raman spectroscopy upon compression to 300 GPa at ambient temperature. The hydrogen vibron frequency begins to decrease after it initially increases with pressure up to 38 GPa. This softening behavior suggests the weakening of the intramolecular bond and the increased intermolecular interactions. Above 237 GPa, the vibron frequency softens very rapidly with pressure at a much higher rate than that of phase III, corresponding to transformation from phase III into phase IV. The phase transition sequence has been confirmed from phase I to phase III and then to phase IV at 208 and 237 GPa, respectively. Previous theoretical calculations lead to the proposal of an energetically favorable monoclinic C2/c structure for phase III and orthorhombic Pbcn structure for phase IV. Up to 304 GPa, solid hydrogen is not yet an alkali metal since the sample is still transparent.
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Received: 06 August 2015
Revised: 23 November 2015
Accepted manuscript online:
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PACS:
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74.25.nd
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(Raman and optical spectroscopy)
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64.60.-i
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(General studies of phase transitions)
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78.30.-j
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(Infrared and Raman spectra)
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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2011CB808200), the Program for Changjiang Scholars and Innovative Research Team in University, China (Grant No. IRT1132), the National Natural Science Foundation of China (Grant Nos. 51032001, 11074090, 10979001, 51025206, 11274137, 11474127, and 11504127), the National Found for Fostering Talents of Basic Science, China (Grant No. J1103202), and the China Postdoctoral Science Foundation (Grant No. 2015M570265). |
Corresponding Authors:
Tian Cui
E-mail: cuitian@jlu.edu.cn
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Cite this article:
Xiaoli Huang(黄晓丽), Fangfei Li(李芳菲), Yanping Huang(黄艳萍), Gang Wu(吴刚), Xin Li(李鑫), Qiang Zhou(周强), Bingbing Liu(刘冰冰), Tian Cui(崔田) High-pressure Raman study of solid hydrogen up to 300 GPa 2016 Chin. Phys. B 25 037401
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