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Thermal Decomposition Kinetics of Ammonium Perchlorate by TGA in Air
Author(s) -
Simchen A. E.
Publication year - 1969
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.196900107
Subject(s) - ammonium perchlorate , chemistry , activation energy , thermal decomposition , kinetics , recrystallization (geology) , pellets , decomposition , kinetic energy , perchlorate , grain size , atmospheric pressure , ammonium , organic chemistry , metallurgy , composite material , ion , paleontology , physics , materials science , oceanography , quantum mechanics , biology , geology
TGA curves were obtained in air at atmospheric pressure, at constant and at uniformly increasing temperatures, for small samples of ammonium perchlorate (AP): (A) AP less than three weeks from its recrystallization; (B) AP four to seven months old; (C) pellets of aged material of known grain size. Activation energies calculated from the kinetic evaluation of the TGA curves show differences between the three groups of samples. The greatest activation energies were obtained for group A, the smallest for group C. The “limited decomposition” of AP below 300°C is lowest for group A; it is below 20% as opposed to above 30% for the other two groups. The reaction controlling the weight loss is of second order. An explanation of these facts is attempted by suggesting an activation energy contribution of lattice defects formed on ageing.