高压下多硅白云母的拉曼光谱学研究

在金刚石压腔中，通过原位拉曼光谱研究了多硅白云母在常温高压下的稳定性。实验获得了多硅白云母从常压到20GPa的拉曼光谱数据，研究了多硅白云母的266、708和3618cm^-1叫谱峰与压力的相关性。研究发现，多硅白云母的708cm^-1叫谱峰随压力增加有规律地向高频方向偏移，与压力的增加呈明显的正相关性，即y（拉曼位移，cm^-1）=0．5238x（压力，GPa）＋712．31，相关系数R^2=0．9656，并且该谱峰在压力4．7GPa时消失，这可能与多硅白云母中的Si、Al替代有关。羟基3618cm^-1谱峰则随压力增加向低频方向移动，谱峰的降低与压力的增加呈明显的线性关系变化（y=-0．3402X＋3617．8，R^2=0．9662），并且强度随着压力的增加也在逐渐减弱，在压力达18GPa时开始消失，推测该压力可能为多硅白云母在常温下脱羟基的极限压力。

A Raman spectroscopic study of phengite under high pressure

Within the diamond anvil cell, the Raman spectroscopic study of phengite was developed at room temperature and under various pressures from 1 atmp to 20 GPa. The authors analyzed the correlation of the modes 266, 708 and 3?618 cm -1 with the variation of pressure. The mode of 708 cm -1 increases linearly with the increase of pressure, i.e., y (Raman shift, cm -1)=0.523?8x (pressure, GPa) +712.31, and R2 (correlation coefficient)=0.965?6, and the mode disappears at 4.7 GPa as a result of substituting Si for Al. The mode of OH- band and the intensity decrease linearly with the increase of pressure, i.e., y=-0.340?2 x+3?617.8 and R2=0.966?2, and the mode disappears at 18 GPa, which is assumed to be the maximum pressure for the dehydration of phengite at room temperature.