Electronic Materials Letters , vol. 4, no. 1, pp.39-43, March, 2008

DOI :

Kinetics of Crystallization in LAS Glass System

Kyu Ho Lee, Tae Ho Kim, Young Seok Kim, Young Joon Jung, Young Hoon Na, and Bong Ki Ryu^*
Pusan National University

Abstract : This paper presents results and observations obtained from a study of crystallization behavior in Li₂O-Al₂O₃-SiO₂ (LAS) glass powders. Variable kinetic parameters have been obtained in order to investigate the crystallization behavior by using non-isothermal differential thermal analysis. LAS glass powders including B₂O₃ which induce a low firing process have been melted and crushed to obtain coarse and fine glass powder. In case of coarse particles with 88 μm, the crystallization have been generated at 649~699°C, the crystallization of fine particles with 44 μm have been observed at 640~684°C according to heating rate. In order to obtain the activation energy of crystallization (EC) and Avramic constant (n), Kissinger and Ozawa equations have been used. The average activation energies of crystallization were [44 μm=48.09±1 kcal/ mol, 88 μm = 53.02±1 kcal/mol] Avramic constant (n) were [44 μm=1.3, 88 μm=1.6] in Li₂O-Al₂O₃-SiO₂ (LAS) glass. Finally, we have observed the surface and bulk crystallization of β-spodumene were occurred simultaneously in this glass powder by using SEM (Scanning Electron Microscopy) and XRD (X-ray diffraction).

Keyword : crystallization kinetics, crystallization, LAS glass, sintering