叶蛇纹石同步辐射X射线粉末衍射脱水动力学研究

doi:10.7523/j.issn.2095-6134.2020.06.010

中国科学院大学学报 ›› 2020, Vol. 37 ›› Issue (6): 793-797.DOI: 10.7523/j.issn.2095-6134.2020.06.010

叶蛇纹石同步辐射X射线粉末衍射脱水动力学研究

刘涛, 申珂玮, 刘川江, 王多君

中国科学院大学地球与行星科学学院, 北京 100049

收稿日期:2019-04-16 修回日期:2019-06-19 发布日期:2020-11-15
通讯作者: 刘涛
基金资助:
国家自然科学基金（41874104，91958216）资助

Kinetic study of antigorite dehydration using synchrotron X-ray powder diffraction

LIU Tao, SHEN Kewei, LIU Chuanjiang, WANG Duojun

College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-04-16 Revised:2019-06-19 Published:2020-11-15

摘要/Abstract

摘要： 采用同步辐射X射线粉末衍射方法在等温条件下研究粒径为~5 μm的叶蛇纹石脱水动力学，在680、700、710和720℃下观测叶蛇纹石脱水前后特征峰随时间变化的特征。结果发现，随加热时间的增加，叶蛇纹石的特征峰缓慢消失，伴有镁橄榄石特征峰出现，但无顽火辉石相出现。通过Avrami方程，获得叶蛇纹石脱水反应级数（n）为1.1~1.3，表明叶蛇纹石脱水过程受晶界成核控制。利用Arrhenius方程，获得叶蛇纹石脱水仅出现镁橄榄石相所需活化能为105.97 kJ/mol，指前因子为333.62 s^-1。

关键词: 叶蛇纹石, 脱水动力学, X射线粉末衍射

Abstract: Synchrotron X-ray powder diffraction method was used to study dehydration kinetics of antigorite with particle size of ~5 μm. The isothermal heating method was used to observe antigorite dehydration at 680, 700, 710, and 720 ℃, respectively. It was found that, with the increase of heating time, the characteristic peak of antigorite slowly disappeared and the characteristic peak of forsterite formed, but no enstatite appeared. The reaction order n is 1.1~1.3 by the Avrami equation, indicating that antigorite dehydration is controlled by grain boundary nucleation. Activation energy for the formation of forsterite from antigorite is 105.97 kJ/mol, and the pre-exponential factor is 333.62 s^-1 in the Arrhenius equation.

Key words: antigorite, dehydration kinetics, X-ray powder diffraction

中图分类号:

O722.4

刘涛, 申珂玮, 刘川江, 王多君. 叶蛇纹石同步辐射X射线粉末衍射脱水动力学研究[J]. 中国科学院大学学报, 2020, 37(6): 793-797.

LIU Tao, SHEN Kewei, LIU Chuanjiang, WANG Duojun. Kinetic study of antigorite dehydration using synchrotron X-ray powder diffraction[J]. , 2020, 37(6): 793-797.

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叶蛇纹石同步辐射X射线粉末衍射脱水动力学研究

Kinetic study of antigorite dehydration using synchrotron X-ray powder diffraction

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