光谱学与光谱分析, 2012, 32 (3): 691, 网络出版: 2012-04-16  

1.0~4.4 GPa下奥长石拉曼光谱特征的变化

Variation of Raman Spectra of Oligoclase under 1.0~4.4 GPa
作者单位
中国地震局地震预测研究所, 北京100036
摘要
常温、 1.0~4.4GPa下, 利用激光拉曼光谱研究了奥长石晶体结构随压力的变化。 发现, 压力为2.9 GPa时, 517 cm-1附近出现新的谱峰, 奥长石开始相变。 3.4 GPa时, 源于奥长石结构中M—O伸缩振动的288 cm-1拉曼谱峰频移发生突变, 517 cm-1附近谱峰消失, 奥长石由三斜晶系完全相变为单斜晶系(P1-I1)。随压力增加, 归属于奥长石四面体结构中Si—O—Si弯曲振动的458 及516 cm-1谱峰随压力增加有规律地向高频方向偏移, 斜率分别是1.667 cm-1/GPa和3.560 cm-1/GPa, 而源于Al—O—Al弯曲振动的480 cm-1谱峰与压力没有明显的线性变化关系。 卸压过程中, 288 cm-1拉曼谱峰频移保持不变, 458, 480及516 cm-1谱峰向低频偏移。 长石类矿物的相变压力与结构中八元环所含阳离子种类有关。
Abstract
Variation of crystal structure of oligoclase with pressure was investigated by the approach of diamond anvil cell (DAC) and in situ micro-Raman spectroscopic measurement at room temperature and under pressures from 1.0 to 4.4 GPa. At 2.9 GPa a new peak round 517 cm-1 appeared, and a new phase was produced. Near 3.4 GPa a major discontinuity occurs in the pressure dependence of 288 cm-1 peak arising from the stretching mode of M—O, and 517 cm-1 peak disappeared, it implied that the oligoclase underwent triclinic to monoclinic phase transition completely at about 3.4 GPa. The peaks at 458 and 516 cm-1 peaks arising from flexural vibrational mode of Si—O—Si shifted linearly with the increasing pressures, the pressure-related slopes are 1.667 cm-1/GPa and 3.560 cm-1/GPa, respectively, whereas, the flexural vibrational mode of Al—O—Al at 480 cm-1 did not shifted linearly with the increasing pressures. The position of 288 cm-1 peak did not change obviously in comparision with 458, 516 and 480 cm-1 peaks, which shifted to lower frequency during decompression. The phase transition pressure of feldspar relates to the species of cation in the octatomic rings.

谢超, 杜建国, 崔月菊, 陈志, 张炜斌, 易丽, 邓莉. 1.0~4.4 GPa下奥长石拉曼光谱特征的变化[J]. 光谱学与光谱分析, 2012, 32(3): 691. XIE Chao, DU Jian-guo, CUI Yue-ju, CHEN Zhi, ZHANG Wei-bin, YI Li, DENG Li. Variation of Raman Spectra of Oligoclase under 1.0~4.4 GPa[J]. Spectroscopy and Spectral Analysis, 2012, 32(3): 691.

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