【摘要】 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谱峰与压力的相关性。研究发现,多硅白云母的708cm-1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R2=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,R2=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。更多还原

【Abstract】 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.更多还原