1. 北京大学地球与空间科学学院, 北京 100871 2. 华南理工大学材料科学与工程学院, 广东 广州 510275 3. 中山大学地球科学与地质工程学院, 广东 广州 510275 4. 广东省地质过程与矿产资源探查重点实验室，广东 广州 510275 5. University of Houston, Department of Earth and Atmospheric Sciences, Houston, Texas 77204-5007, USA 6. 中国科学院地质与地球物理研究所，中国科学院矿产资源研究重点实验室, 北京 100029
Raman Spectra of Bredigite at High Temperature and High Pressure
XIONG Zhi-hua1, ZHAO Ming-zhen2, HE Jun-guo3,4*, LI Yi-peng5, LI Hong-zhong4,6*
1. School of Earth and Space Science, Peking University, Beijing 100871, China 2. School of Material Science and Engineering, South China University of Technology, Guangzhou 510275, China 3. School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou 510275, China 4. Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China 5. University of Houston, Department of Earth and Atmospheric Sciences，Houston, Texas 77204-5007, USA 6. Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract：Bredigite was synthesized by using the Piston-Cylinder in 1.2 GPa and 1 473 K. With external heating device and diamond anvil cell, high temperature and high pressure Raman spectra of bredigite were collected at temperatures 298, 353, 463, 543, 663, 773 and 873 K and with pressure from 1 atm up to 14.36 GPa (room temperature). The SEM image showed that the sample consisted of one crystalline phase with grain size ranging from 10～20 μm. The EPMA data suggest a chemical formula of Ca7.03(2)Mg0.98(2)Si3.94(2)O16 which was identical to the theoretical component of bredigite. The Raman spectroscopic results indicate there were 29 vibration bands of bredigite at high temperature. Some bands were merging, weakening and disappearing increasingly with the temperature, which was obvious in the range of 800~1 200 cm-1. The vibration bands of 909, 927 and 950 cm-1 disappeared at 873, 773 and 873 K, respectively. The results primarily indicated that the structure of bredigite was stable under experimental condition. In addition, isobaric mode-Grüneisen parameters and isothermal mode-Grüneisen parameters were calculated, yielding 1.47(2) and 0.45(3) as their mean values, respectively. Anharmonic coefficients were estimated based on the high temperature and high pressure Raman experiments, showing that the contributions to anharmonic-effect induced with the Si—O vibration modes were smaller than other modes.
Key words：Bredigite;High temperature Raman;High pressure Raman;Anharmonic coefficients
熊志华1，赵明臻2，何俊国3, 4*，李羿芃5，李红中4, 6* . 白硅钙石的高温高压拉曼光谱研究 [J]. 光谱学与光谱分析, 2016, 36(10): 3404-3409.
XIONG Zhi-hua1, ZHAO Ming-zhen2, HE Jun-guo3,4*, LI Yi-peng5, LI Hong-zhong4,6* . Raman Spectra of Bredigite at High Temperature and High Pressure . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2016, 36(10): 3404-3409.
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