Investigating the Kinetic Parameters of SiO2-Al2O3-CaO-CaF2-K2O Oxyfluoride Glass
عنوان مقاله: Investigating the Kinetic Parameters of SiO2-Al2O3-CaO-CaF2-K2O Oxyfluoride Glass
شناسه ملی مقاله: JR_ACERPT-6-4_001
منتشر شده در در سال 1399
شناسه ملی مقاله: JR_ACERPT-6-4_001
منتشر شده در در سال 1399
مشخصات نویسندگان مقاله:
M. Soleymani Zarabad - Department of Materials Science and Engineering, University of Tabriz, Tabriz, East Azerbaijan, Iran
M. Rezvani - Department of Materials Science and Engineering, University of Tabriz, Tabriz, East Azerbaijan, Iran
خلاصه مقاله:
M. Soleymani Zarabad - Department of Materials Science and Engineering, University of Tabriz, Tabriz, East Azerbaijan, Iran
M. Rezvani - Department of Materials Science and Engineering, University of Tabriz, Tabriz, East Azerbaijan, Iran
Oxyfluoride glass-ceramics containing CaF2 nanocrystals are kind of attractive materials for the optical applications due to their low phonon energy and high transparency. Moreover, the crystallization control and consequently, the kinetic properties are important for oxyfluoride glasses. Therefore, in the present research, the crystallization kinetics of isochronal transformation of the 37.26SiO2-28.11Al2O3-7.73CaO-26.89CaF2-4.5 K2O (wt%) glass have been determined upon the basis of maximum transformation rate using Differential Thermal Analysis (DTA) technique. Hence, it is concluded that the crystallization of the mentioned glass is a process controlled by Avrami nucleation, three-dimensional diffusion-controlled growth, and anisotropic growth impingement mode. The effective activation energy Qp =181 kJ.mol-1, growth exponent n=2.272, nucleation activation energy QN= 123, and growth activation energy QG=211 have been determined.
کلمات کلیدی: Oxyfluoride Glass-Ceramics, Kinetic parameters, Crystallization Mechanism
صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/1170552/