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

doi:10.7523/j.issn.2095-6134.2020.06.010

Abstract

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

CLC Number:

O722.4

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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