Kinetic analysis of the thermal decomposition of pristine and yirradiated cadmium acetate

Abstract

The kinetics of the thermal decomposition of unirradiated (pristine) and preyirradiated anhydrous cadmium acetate was studied in the temperature range (298773 k) and in air using isothermal and dynamics thermogravimetric techniques The data were analyzed using various solid state reaction models Integral method using coatredfon equation was applied in dynamic data analysis The results showed that the kinetic of isothermal decomposition for acceleratory stage was governed by two dimensional phase boundry movement (R2) while in nonisothermal (dynamic) decomposition the kinetic was controlled by nucleation and growth model with dimensional growth (A2) for unirradiated and three dimensional growth (A3) for yirradiated cadmium acetate The activation energies of the main decomposition process for unirradiated and preyirradiated samples were calculated and the results of the isothermal and dynamic integral methods were compared and discussed The change in texture and crystal structure of the investigated cadmium scetate by yirradiation was studied using electron microscopy and xray diffraction technique