Thermal decomposition kinetics of potassium iodate

The rate and kinetics of the thermal decomposition of potassium iodate (KIO₃) has been studied as a function of particle size, in the range 63?C150???m, by isothermal thermogravimetry at different temperatures, 790, 795, 800 and 805?K in nitrogen atmosphere. The theoretical and experimental mass loss data are in good agreement for the thermal decomposition of all samples of KIO₃ at all temperatures studied. The isothermal decomposition of all samples of KIO₃ was subjected to both model-fitting and model-free (isoconversional) kinetic methods of analysis. It has been observed that the activation energy values are independent of the particle size. Isothermal model-fitting analysis shows that the thermal decomposition kinetics of all the samples of KIO₃ studied can be best described by the contracting cube equation.