Velocity and Stability of Condensed Polymorphic SiH$_{4}$: A High-Temperature High-Pressure Brillouin Investigation *
Jiayu Wang , Qiang Zhou , Siyang Guo , Yanping Huang , Xiaoli Huang , Lu Wang** , Fangfei Li** , Tian Cui
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
Abstract ：Silane (SiH$_{4}$) is a promising hydrogen-rich compound for pursing high temperature superconducting. Previous high pressure measurements of Raman, x-ray diffraction and theoretical studies on SiH$_{4}$ mainly focused on its polymorphic structures above 50 GPa, while the structure and the stability under lower pressure range are still unclear. Here we report an investigation of condensed SiH$_{4}$ by Brillouin scattering measurements at high temperature up to 407 K and high pressure up to 18 GPa. Brillouin scattering frequencies of fluid SiH$_{4}$ under compression are obtained under isothermal conditions of 300 K, 359 K and 407 K. The SiH$_{4}$ becomes unstable with increasing temperature and subsequently decomposes into silicon and H$_{2}$. We find that compression at room temperature induces two velocity anomalies corresponding to a fluid-solid state transition and a phase IV to phase V transition, respectively. Brillouin scattering spectra has been a powerful tool to investigate the fruitful phases and structure transitions in the hydrogen-rich compound under extreme conditions.
收稿日期: 2020-03-28
出版日期: 2020-05-26
PACS:
62.50.-p
(High-pressure effects in solids and liquids)
62.60.+v
(Acoustical properties of liquids)
64.60.-i
(General studies of phase transitions)
78.35.+c
(Brillouin and Rayleigh scattering; other light scattering)
引用本文:
. [J]. 中国物理快报, 2020, 37(6): 66201-.
链接本文:
http://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/62/066201
或
http://cpl.iphy.ac.cn/CN/Y2020/V37/I6/66201
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2020, Vol. 37 
