Changes in the Hydrogen-Bonded Structure of Lawsonite: An Experimental Study to 2.5 GPa and 400 ℃  

作　　者：杨玉萍 张立飞 

机构地区：[1]Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University

出　　处：《Journal of Earth Science》2010年第5期811-816,共6页地球科学学刊（英文版）

基　　金：supported by the National Basic Research Pro-gram of China (No. 2009CB825007);the National Natural Science Foundation of China (Nos. 40730314, 40821002)

摘　　要：In-situ Raman spectroscopic ts of lawsonite in the OH and H20 stretching region were conducted up to approximately 2.5 GPa and 400 ℃ with a hydrothermal diamondanvil cell. In the experimental design at room temperature, the ratio of band-area and the width at half maximum of the decomposed Raman band shows discontinuities at 0.8 GPa, and correspondingly, the 695-cm1 peak in the low-wavenumber region was split into two peaks. In the experiments at high temperature, the splitting of the 695-cm^-1 peak was induced at 2.4 GPa and 250 ℃ These findings demonstrate the existence of discontinuities in the pressure response of the strength of the hydrogen bonds, which suggests a possible change of the hydrogen-bonded structure in lawsonite under these conditions.In-situ Raman spectroscopic ts of lawsonite in the OH and H20 stretching region were conducted up to approximately 2.5 GPa and 400 ℃ with a hydrothermal diamondanvil cell. In the experimental design at room temperature, the ratio of band-area and the width at half maximum of the decomposed Raman band shows discontinuities at 0.8 GPa, and correspondingly, the 695-cm1 peak in the low-wavenumber region was split into two peaks. In the experiments at high temperature, the splitting of the 695-cm^-1 peak was induced at 2.4 GPa and 250 ℃ These findings demonstrate the existence of discontinuities in the pressure response of the strength of the hydrogen bonds, which suggests a possible change of the hydrogen-bonded structure in lawsonite under these conditions.

关 键 词：LAWSONITE hydrogen bonded Raman spectra high pressure. 

分 类 号：P589.1[天文地球—岩石学]