Abstract
The kinetics of sublimation of ammonium azide have been investigated over the temperature range 360–389 K in a continuous flow of dry argon by thermogravimetry (TG). Sublimation follows zero-order kinetics with a corresponding activation energy of 93.3 kJ mol −1 which is slightly higher than its heat of sublimation (73.4 kJ mol −1) determined from differential scanning calorimetric (DSC) cooling thermograms. The mechanism for sublimation is critically discussed with reference to ammonium perchlorate and ammonium halide systems. It is suggested that ammonium azide undergoes molecular sublimation and that the vapor readily dissociates above 418 K into NH 3 and HN 3. The heat of formation of 185.6 kJ mol −1 was deduced for gaseous NH 4N 3.
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