The thermal decomposition of potassium bro- mate (KBrO3) has been studied as a function of particle size, in the range 53-150 lm, by isothermal thermogravi- metry at different temperatures, viz. 668, 673, 678, and 683 K in static air atmosphere. The theoretical and experimental mass loss data are in good agreement for the thermal decomposition of all samples of KBrO3 at all temperatures studied. The isothermal decomposition of all samples of KBrO3 was subjected to both model fitting and model-free (isoconversional) kinetic methods of analysis. Isothermal model fitting analysis shows that the thermal decomposition kinetics of all the samples of KBrO3 studied can be best described by the contracting square equation. Contrary to the expected increase in rate followed by a decrease with decrease in particle size, KBrO3 shows a regular increase in rate with reduction in particle size, which, we suggest, is an impact of melting of this solid during decomposition.

The effect of particle size on the thermal decomposition kinetics of potassium bromate

Cobalt oxalate dihydrate nanopowders have been prepared by precipitation method. The crystal size of Co(C2O4)·2H2O obtained in the absence and presence of CTAB surfactant was 30 and 60 nm, respectively. The effect of particle size on the thermal decomposition of Co(C2O4)·2H2O powders in air was investigated by thermogravimetry (TG) and derivative thermogravimetry (DTG). Non-isothermal studies revealed that the decomposition occurred in two main stages: removal of water and next decomposition of CoC2O4 to Co3O4. Both oxalate and the final decomposition residue were characterized by means of XRD, FT-IR and TEM techniques. The kinetic parameters of the two decomposition steps were evaluated from TG to DTG data by several integral and differential calculation methods. Based on the iterative isoconversional calculation procedure, the activation energy values E
 it associated with the decomposition steps were evaluated. Kinetic parameters are given, and the most probable mechanism functions are suggested. The results show that the decomposition increases with decreasing the particle size.

The effect of particle size on the kinetics of thermal decomposition of Co(C2O4)·2H2O nanopowders under non-isothermal conditions

Influence of trivalent ion dopants on the thermal decomposition kinetics of potassium bromate

The thermal decomposition of un-irradiated and gamma-irradiated potassium bromate (KBrO3) was performed under non-isothermal conditions at different heating rates (5, 10, 15 and 20 K min−1). The data was analysed using isoconversional and non-isoconversional methods. The kinetic parameters of thermal decomposition process were obtained by three model-free isoconversional methods: Flynn–Wall–Ozawa, Kissinger–Akahira–Sunose and Friedman. Irradiation enhances the decomposition and the effect increases with the irradiation dose. The activation energy decreases on irradiation. Kinetic analysis of data in view of various solid-state reaction models showed that the decomposition of un-irradiated and irradiated anhydrous KBrO3 is best described by the Avrami–Erofeev model equation, [−ln(l−α)]1/2 = kt.

Kinetic analysis for non-isothermal decomposition of un-irradiated and gamma-irradiated potassium bromate

γ-Irradiation effects on the non-isothermal decomposition of strontium nitrate by model-free and model-fitting methods

Pure and doped samples of potassium bromate (KBrO3) were subjected to precompression and their thermal decomposition kinetics was studied by thermogravimetry at 668 K. The samples decomposed in two stages governed by the same rate law (contracting square equation), but with different rate constants, k
 1 (for a α ≤ 0.45) and k
 2 (for α ≥ 0.45), as in the case of uncompressed samples. The rate constants k
 1 and k
 2 decreased dramatically on precompression, the decrease being higher for doped samples. Cation dopants (Ba2+, Al3+) caused more desensitization effect than the anion dopants (
 $$ {\text{SO}}_{4}{}^{ 2- } $$
 , PO4
 3−) of the same magnitude of charge and concentration. The results favor ionic diffusion mechanism proposed earlier on the basis of doping studies.

Effect of precompression on isothermal decomposition kinetics of pure and doped potassium bromate

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Effect of precompression on isothermal decomposition kinetics of pure and doped potassium bromate