K. Daimon et Y. Hikichi, Kinetics for thermal decomposition of anhydrous aluminum sulfate powder composed of single crystal rhombohedrons in shape, NIP KAG KAI, (8), 1999, pp. 557-559
The anhydrous aluminum sulfate powder composed of rhombohedral single-cryst
al grains was prepared by precipitation from a concentrated sulfuric acid s
olution. The average grain size and the size distribution was 3.8+/-0.7 mu
m. Thermal decomposition behavior of the anhydrous aluminum sulfate was inv
estigated by thermogravimetric measurements. The kinetics of the thermal de
composition fitted to a contracting volume model with an apparent activatio
n energy of 360 kJ/mol. The mobility of the reaction boundary of the therma
l decomposition at 760 degrees C was estimated to be about 7.0 x 10(-5) mu
m/s. The temperature dependence of the mobility was expressed by an Arrheni
us type equation.