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

• Published in: Journal of radioanalytical and nuclear chemistry Vol. 295; no. 1; pp. 53 - 61
• Main Authors: Samuel, Jadu, Surendran, Athira, Culas, Sunil
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2013; Springer
• Subjects: Analysis; Chemistry; Chemistry and Materials Science; Decomposition; Diagnostic Radiology; Gamma rays; Hadrons; Heavy Ions; Inorganic Chemistry; Irradiation; Mathematical analysis; Mathematical models; Nuclear Chemistry; Nuclear Physics; Physical Chemistry; Potassium bromate; Reaction kinetics; Thermal decomposition; Kinetics and mechanism; Isokinetic relationship; Potassium bromate; Non-isothermal kinetic study; Effect of gamma-ray
• ISSN: 0236-5731; 1588-2780
• DOI: 10.1007/s10967-012-1916-6

The thermal decomposition of un-irradiated and gamma-irradiated potassium bromate (KBrO 3 ) 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 KBrO 3 is best described by the Avrami–Erofeev model equation, [−ln(l− α )] 1/2  =  kt .