High-pressure structural properties of tetramethylsilane
Zhen-Xing Qin(秦振兴)1,2 and Xiao-Jia Chen(陈晓嘉)3
1. Department of Physics, Taiyuan University of Science and Technology, Taiyuan 030024, China; 2. Department of Physics, South China University of Technology, Guangzhou 510640, China; 3. Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
Abstract High-pressure structural properties of tetramethylsilane are investigated by synchrotron powder x-ray diffraction at pressures up to 31.1 GPa and room temperature. A phase with the space group of Pnma is found to appear at 4.2 GPa. Upon compression, the compound transforms to two following phases: the phase with space groups of P21/c at 9.9 GPa and the phase with P2/m at 18.2 GPa successively via a transitional phase. The unique structural character of P21/c supports the phase stability of tetramethylsilane without possible decomposition upon heavy compression. The appearance of the P2/m phase suggests the possible realization of metallization for this material at higher pressure.
Fund: Project supported by the Cultivation Fund of the Key Scientific and Technical Innovation Project from Ministry of Education of China (Grant No. 708070), the Fundamental Research Funds for the Central Universities, South China University of Technology (Grant No. 2014ZZ0069), the National Natural Science Foundation of China (Grant No. 51502189), and the Doctoral Project of Taiyuan University of Science and Technology, China (Grant No. 20132010).
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