Abstract
Dehydration behavior of muscovite flake was investigated at 760–860°C by using in situ high-temperature IR microspectroscopy for the OH absorption band around 3,620 cm−1. Isothermal kinetic heating experiments at each temperature gave detailed decrease curves of the OH band area with time. These curves have been simulated by the first and second order reactions or mono- and two-dimensional diffusion processes. The mono-dimensional diffusion was found to give the best fit to the experimental data and apparent diffusion coefficients D were determined at 760–860°C with the activation energy of 290 ± 20 kJ/mol. The apparent diffusion coefficients D varied with the sample thickness L. This variation can be explained by an m layers model with a unit length of L′ with a constant diffusion coefficient D′. Therefore, the dehydration process might be rate-limited by mono-dimensional diffusion through tetrahedral silicate sheet perpendicular to (001) planes of muscovite with a unit length of L′.
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Acknowledgments
We are grateful to SII-NT for their kind assistance in thermogravimetry of the samples. We thank Ms. M. Yoshizaki of Tokyo Institute of Technology for her assistance of the EPMA analyses. We also thank Dr. M. Katsura, Mr. Y. Kirino and Dr. T. Yokoyama of Osaka University for their helpful supports in the data fitting procedures and constructive comments.
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Tokiwai, K., Nakashima, S. Dehydration kinetics of muscovite by in situ infrared microspectroscopy. Phys Chem Minerals 37, 91–101 (2010). https://doi.org/10.1007/s00269-009-0313-3
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DOI: https://doi.org/10.1007/s00269-009-0313-3