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Thermal decomposition kinetics of potassium iodate

Part I. The effect of particle size on the rate and kinetics of decomposition

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Abstract

The rate and kinetics of the thermal decomposition of potassium iodate (KIO3) has been studied as a function of particle size, in the range 63–150 μm, 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.

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  1. Department of Chemistry, University of Calicut, Calicut, Kerala, 673 635, India

    K. Muraleedharan

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  1. K. Muraleedharan
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Correspondence to K. Muraleedharan.

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Muraleedharan, K. Thermal decomposition kinetics of potassium iodate. J Therm Anal Calorim 109, 237–245 (2012). https://doi.org/10.1007/s10973-011-1711-6

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  • DOI: https://doi.org/10.1007/s10973-011-1711-6

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