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arXiv 1604.05752cond-mat.mtrl-sci
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高压下的硫化氢:化学计量的变化

Hydrogen sulfide at high pressure: change in stoichiometry

Alexander F. Goncharov, Sergey Lobanov, Ivan Kruglov, Xiao-Miao Zhao, Xiao-Jia Chen, Artem R. Oganov, Zuzana Konôpková, Vitali Prakapenka

摘要:

利用X射线同步辐射衍射(XRD)和拉曼光谱研究了硫化氢(H2S)在180-295 K、150 GPa压力下的气体动力学行为,并通过量子力学变组分演化模拟研究了硫化氢气体动力学行为。实验表明,H2S在形成具有不同结构和组成的新化合物时变得不稳定,包括Cccm和体心立方(bcc)样(R3 m或Im-3 m)H3 S,后者先前预测显示出创纪录的高超导转变温度,Tc为203 K。这些实验为理解这一创纪录的高Tc提供了实验基础。实验结果得到了理论结构搜索的支持,表明新的H3 S,H4 S3,H5 S8,H3 S5和HS 2化合物在高压下的稳定性。

英文摘要:

Hydrogen-sulfide (H2S) was studied by x-ray synchrotron diffraction (XRD) and Raman spectroscopy up to 150 GPa at 180-295 K and by quantum-mechanical variable-composition evolutionary simulations. The experiments show that H2S becomes unstable with respect to formation of new compounds with different structure and composition, including Cccm and a body-centered-cubic (bcc) like (R3m or Im-3m) H3S, the latter one predicted previously to show a record-high superconducting transition temperature, Tc of 203 K. These experiments provide experimental ground for understanding of this record high Tc. The experimental results are supported by theoretical structure searches that suggest the stability of new H3S, H4S3, H5S8, H3S5, and HS2 compounds at elevated pressures.

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