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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 were investigated by synchrotron powder x-ray diffraction at temperatures 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 via a transitional phase. The unique structural character of P2_1 / c supports the phase stability of tetramethylsilane without possible decomposition of heavy compression. The appearance of the P2 / m phase suggests the possible realization of metallization for this material at higher pressure.