Kinetic Analysis of Crystallization in Li_1.3Al_0.3Ti_1.7(PO₄)₃ Glass Ceramics

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• 作者：Calvin Davis III ; Andre L. Pertuit and Juan C. Nino
• 刊名：Journal of the American Ceramic Society
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：99
• 期：10
• 页码：3260-3266
• 全文大小：1412K
• ISSN：1551-2916

文摘

The crystallization mechanisms for Li_1.3Al_0.3Ti_1.7(PO₄)₃ (LATP) glass ceramics were studied using thermophysical property characterization techniques. Differential scanning calorimetry (DSC) revealed two separate exothermic events that were ascribed to the initial growth and growth to coherency of a dendritic phase. It was found that the commonly used Johnson-Mehl-Avrami is not a suitable kinetic model for this material. Rather, the Sestak-Berggren (SB) autocatalytic kinetic model was used to analyze the DSC data and the activation energy for initial growth (259 kJ/mol) and coherency (272 kJ/mol) was calculated using isoconversional methods. The calculated parameters for the SB model were used to compare experimental and calculated values for heat flow during the crystallization of LATP and good fits were found for both exothermic events.