Abstract
AbstractWe propose a new generalized method for the determination of surface crystallization growth rates in a wide temperature range using a single Differential Scanning Calorimetry (DSC) experiment. It can be applied to different sample geometries—we have tested the method for powdered and millimetric cubic samples. The crystal growth rate is calculated from the DSC crystallization peak profile and the average particle size. The method was successfully tested using diopside (MgO·CaO·SiO2) glass powders and a sodium disilicate glass (Na2O·2SiO2) millimetric cube, which undergoes exclusive stoichiometric surface crystallization. The resulting crystal growth rates spanned ranges of approximately 60 K for diopside glass and 170 K for sodium disilicate. The method is very convenient, requiring a single DSC run and simple sample preparation. The crystal growth rates, , proved to be accurate when compared to literature optical microscopy measurements, with a root mean square deviation of 0.22 in for diopside glass.
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