Determining crystallization kinetic parameters of Li 2O–Al 2O 3–SiO 2 glass from derivative differential thermal analysis curves

Abstract

The kinetic parameters such as crystallization activation energy, E, and the frequency factor, ν, of Li 2O–Al 2O 3–SiO 2 glass were determined by a new non-isothermal method. The method is described by the equation ln T f 2/β = E/RT f + ln(E/R)− ln ν , where β is the heating rate and T f is the inflection-point temperature of differential thermal analysis (DTA). The value of T f is determined as the maximum peak temperature on derivative differential thermal analysis (DDTA) curves. Values of E and ν of Li 2O–Al 2O 3–SiO 2 glass were also determined by two existing non-isothermal methods, namely the Kissinger plot and the Ozawa plot, and compared with those determined by isothermal method. Values of E and ν determined by the proposed equation were 332 kJ/mol and 1.4×10 13 s −1, respectively. They are excellent agreement with the isothermal analysis results, 336 kJ/mol and 1.8×10 13 s −1, respectively. In contrast, both the Kissinger equation and the Ozawa equation give much higher values of E and ν.