常温和100~800 MPa压力下石膏的Raman光谱研究

 利用金刚石压腔装置测量了高压下石膏中S—O键的4种振动模式和结晶水中羟基伸缩振动Raman位移，研究结果表明：在常温（25 ℃）和100~800 MPa压力范围内，石膏中S—O键的Raman谱峰的位移随压力的增加而向高波数方向移动，结晶水中羟基的两个伸缩谱峰随着压力的增加而向低波数方向移动，同时得到了各个谱峰与压力之间的关系式，其中结晶水中羟基的两个伸缩谱峰的dν/dp值有较大不同，是由于结晶水中含有两个强度不同的氢键所致。

Research on the Raman Spectra of Gypsum at Pressure of 100～800MPa and Room Temperature

This paper measures the Raman peak displacements of the four vibration modes of S—O bonding and the hydroxyl-stretching vibration modes in the gypsum at high pressures using diamond anvil cell. The experimental results show that at the temperature of 25 ℃ and the pressure of 100～800 MPa the Raman peak positions of the S—O bonding in the gysum shift to high wave numbers with the increase of the system pressure, while the Raman peak positions of hydroxyl-stretching vibrations shift to low wave numbers with the increase of the system pressure. The relations between the Raman peak positions and system pressure were obtained, and the two dν/dp values of hydroxyl-stretching vibrations show a great difference because of different intensity of the hydrogen bonding.