Kinetic parameters for crystallization in DICOR(R) glass

被引：3

作者：

Bapna, MS ^{[1
]}

Mueller, HJ ^{[1
]}

Campbell, SD ^{[1
]}

机构：

[1] AMER DENT ASSOC,DIV SCI,MAT SCI RES,CHICAGO,IL 60611

来源：

THERMOCHIMICA ACTA | 1996年 / 275卷 / 02期

关键词：

crystallization; DTA; DICOR(R) glass; kinetic parameters;

D O I：

10.1016/0040-6031(95)02703-3

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The reaction kinetics of crystallization of tetrasilicic flourmica in DICOR(R) glass was followed non-isothermally by differential thermal analysis (DTA), and analysed using Johnson-Mehl-Avrami equation for determining the activation energy, reaction order, and the pre-exponential parameters. The DTA curves showed a single exothermic crystallization peak in the temperature range of 745-850 degrees C, just above the glass transition temperature. The activation energy E(c), the reaction order n, and the pre-exponential factor nu, of crystallization were computed to be 203 kJ mol-l 3.4 +/- 0.20, and 2.88 x 10(11) s(-1) respectively. These observations suggest that the crystallization of mica in DICOR(R) glass occurs by a cellular precipitation mechanism where the nucleation occurs only at the start of the transformation,

引用

页码：287 / 293

页数：7

共 19 条

[1] CALCULATION OF AVRAMI PARAMETERS FOR HETEROGENEOUS SOLID-STATE REACTIONS USING A MODIFICATION OF KISSINGER METHOD [J].