Properties and phase diagram of (H_2S)_2H_2

Edward J. Pace; Xiao-Di Liu; Philip Dalladay-Simpson; Jack Binns; Miriam Pena-Alvarez; J. Paul Attfield; Ross T. Howie; Eugene Gregoryanz

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Properties and phase diagram of (H_2S)_2H_2

机译：（h_2s）_2h_2的属性和相图

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By combining hydrogen and sulfur within diamond-anvil cells we synthesize (H_2S)_2H_2 at 5 GPa and 373 K. Through a series of Raman spectroscopy, infrared spectroscopy, and synchrotron x-ray diffraction experiments we have constrained the phase diagram of (H_2S)_2H_2 within a wide P-T range. On compression we observe the phase transition sequence of Ⅰ-Ⅱ-Ⅱ'-Ⅲ, where Ⅱ' is a previously unreported phase; at room temperature this sequence spans from 5 to 47 GPa, while the application of low temperatures stabilizes this sequence to 127 GPa (＜ 80K). Above these pressures we propose that phase Ⅲ of (H_2S)_2H_2 transforms to a nonmolecular H_3S network. Our Raman and infrared measurements indicate that the transition from (H_2S)_2H_2 to H_3S is reversible at room temperature. X-ray diffraction reveals that the symmetry of the underlying S lattice of (H_2S)_2H_2 and H_3S is retained along this compression path up to at least 135 GPa.

机译：通过将氢气和硫组合在金刚石 - 砧座中，我们在5GPa和373k中合成（H_2S）_2H_2。通过一系列拉曼光谱，红外光谱和同步射频X射线衍射实验，我们限制了（H_2S）的相图_2h_2在宽的Pt范围内。压缩Ⅰ-Ⅱ-Ⅱ'-Ⅲ的相转移顺序，其中Ⅱ'是先前未报告的阶段;在室温下，该序列跨越5至47GPa，而低温施加稳定在127GPa（<80K）中稳定该序列。在这些压力之上，我们提出（H_2S）_2H_2的阶段Ⅲ阶段转变为非分子H_3S网络。我们的拉曼和红外测量表明，从（H_2S）_2H_2至H_3S的转变在室温下可逆。 X射线衍射揭示了（H_2S）_2H_2和H_3S的底层S晶格的对称性沿着该压缩路径保留至少135GPa。

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来源
《Physical review》 |2020年第17期|174511.1-174511.8|共8页
作者
Edward J. Pace; Xiao-Di Liu; Philip Dalladay-Simpson; Jack Binns; Miriam Pena-Alvarez; J. Paul Attfield; Ross T. Howie; Eugene Gregoryanz;
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Centre for Science at Extreme Conditions and School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3FD United Kingdom;

Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China;

Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China;

Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China School of Science RMIT University Melbourne Victoria 3000 Australia;

Centre for Science at Extreme Conditions and School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3FD United Kingdom;

Centre for Science at Extreme Conditions and School of Chemistry University of Edinburgh Edinburgh EH9 3FD United Kingdom;

Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China;

Centre for Science at Extreme Conditions and School of Physics and Astronomy University of Edinburgh Edinburgh EH9 3FD United Kingdom Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China;

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Properties and phase diagram of (H_2S)_2H_2

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