方解石高压相变的拉曼光谱研究  

Research on Raman Spectra of Calcite Phase Transition at High Pressure

作　　者：王世霞[1,2] 郑海飞[2] 

机构地区：[1]北京大学地球与空间科学学院,造山带与地壳演化教育部重点实验室,北京100871 [2]中国地质科学院地质研究所,国土资源部同位素重点实验室,北京100037

出　　处：《光谱学与光谱分析》2011年第8期2117-2119,共3页Spectroscopy and Spectral Analysis

基　　金：国家重点基础研究发展计划(2006CB403508);国家自然科学基金项目(40873047)资助

摘　　要：应用金刚石压腔结合拉曼光谱技术研究了方解石-Ⅰ在静水高压作用下相转变为方解石-Ⅲ的过程。结果表明,压力增大的过程中,方解石-Ⅰ晶体的三个拉曼特征峰均向高频移动;在1 103MPa条件下,体系中的水介质结冰,冰点处方解石-Ⅰ晶体性质没有变化;继续加压至1 752MPa时矿物的拉曼特征峰发生了突变,表明晶体由方解石-Ⅰ相转变为方解石-Ⅲ相中的的A型方解石;相变后矿物的拉曼特征峰显示了从矿物内部向边缘的过渡中,相变程度逐渐增大的趋势;该研究也体现了金刚石压腔结合拉曼光谱技术在定性分析矿物结构相变过程中原位测试的优势。The present research studied the process of phase transition from calcite-Ⅰ to calcite-Ⅲ under the condition of high hydrostatic pressure using hydrothermal diamond anvil cell and Raman spectrum technique.The hydrothermal diamond anvil cell is the most useful instrument to observe sample in-situation under high temperature and high pressure.The authors can get effective results from this instrument and pursue further research.The method of Raman spectra is the most useful measure tool and it can detect the material according to the spectrum.The result shows that three characteristic Raman peaks of calcite-Ⅰ move to high-position with adding pressure.Water media in system becomes frozen at the pressure of 1 103 MPa,and there is no change in the structure of calcite-Ⅰ.The abrupt change of characteristic Raman peaks of calcite-Ⅰ happens when the system pressure reaches 1 752 MPa,and changed characteristic Raman peaks explain that calcite-Ⅰ changes to calcite-Ⅲ.There are two types of calcite-Ⅲ,and type A happens in the system because of the effect of hydrostatic pressure.The characteristic Raman peak in different areas of minerals shows that the degree of phase transition becomes larger from inner part to edge part.The research also shows the advantage of hydrothermal diamond anvil cell and Raman spectrum for qualitative analysis of mineral structure using in-situ technique.

关 键 词：高压 方解石 拉曼位移 相变 

分 类 号：O657.3[理学—分析化学]