【摘要】 本文在0～13GPa压力范围内测量了石墨Raman活性模E_?的频率随压力的变化,结果表明在4GPa附近dγ/dp出现了不连续点,该点前的dγ/dp大于该点后的dγ/dp,这是由于在压力的作用下石墨六角网格发生畸变所致。本工作还导出了高压状态下C—C键力常数的表达式,对E.Fitzer在常压下用Raman频率计算C—C键长的计算公式进行了修正。更多还原

【Abstract】 The frequency changes of Raman active mode E2g of graphite were measured with pressure in the range of 0 to 13GPa. The reaults show that a discontinuity in dγ/dp appeared near 4GPa and that dγ/dp is larger before the discontinuos point than behind it. This may be caused by the distortion of the hexgonal network of graphite near 4GPa. In this paper, we also obtained a relation about the force constant of C-C bonding of graphite under high pressure and revised E. Fitzer’ s equation on calculating the length of C - C bonding with Raman frequency at ambient pressure.更多还原