摘要
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 P2_1/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 P2_1/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.
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 P2_1/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 P2_1/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.
基金
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)
the Doctoral Project of Taiyuan University of Science and Technology,China(Grant No.20132010)
