Abstract
MgAl 2O 4 was prepared by cocrystallizing and decomposing Al(NO 3) 3.9H 2O and Mg(NO 3) 2.6H 2O mixture. The crystallite growth of the resulting powder was studied in the temperature range 500 – 1000 °C. It was found that the equation governing the process is D 2 – D 2 0 = KT. Two activation energies for crystallite growth were obtained, 22 kcal and 44 kcal for the temperature ranges 500 – 785 °C and 785 – 1000 °C respectively. It was noted that rapid increase in crystallite size occurred on soaking at a temperature > 800 °C.
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