Low-temperature thermal decomposition of crystalline partly and completely deuterated ammonium perchlorate
Although ammonium perchlorate, widely used as a rocket propellant, has been extensively investigated for many years, the mechanism of its thermal decomposition at low temperatures remains controversial. Examination of the thermal behaviour of large crystals of partly and completely deuterated ammonium perchlorate by DSC, SEM, TG and QMS reveals that the rates of thermal decomposition depend on the degree of deuteration and decrease in the sequence N[H/D]4ClO4 > NH4ClO4 > ND4ClO4.
Majda, Dorota,Korobov, Alexander,Filek, Urszula,Sulikowski, Bogdan,Midgley, Paul,Nicol, David A.,Klinowski, Jacek
Low-temperature thermal decomposition of large single crystals of ammonium perchlorate
Similarities and differences in the thermal behaviour of deuterated and nondeuterated ammonium perchlorate provide insights into the mechanism of its thermal decomposition. Thermal decomposition of NH4 ClO4 and ND4 ClO4 always begins in the bulk of the crystals. In both cases decomposition stops when the degree of conversion is about 30%, giving porous products which undergo the same phase transition as the parent single crystals. Thermal decomposition of the deuterated sample is slower, the volume fraction of pores appears to be lower and the sample has a small quantity of 'snow' on the surface. These effects are best rationalized as caused by proton transfer at the intersections of dislocations in the bulk of the crystals.
Majda, Dorota,Korobov, Alexander,Filek, Urszula,Sulikowski, Bogdan,Midgley, Paul,Vowles, David,Klinowski, Jacek
p. 233 - 236
(2009/02/02)
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