Application of isoconversional calculation procedure to non-isothermal kinetic study: III. Thermal decomposition of ammonium cobalt phosphate hydrate

The single phase NH4CoPO4·H2O with layered structure was prepared via solid-state reaction at 60 °C. Based on the iterative isoconversional calculation procedure, the values of activation energy Ea associated with the first, second and third stages of the thermal decomposition of NH4CoPO4·H2O were obtained, which demonstrate that the three stages are all a single-step kinetic process and can be adequately described by a unique kinetic triplet. The most probable reaction mechanisms of the three stages were estimated by comparison between experimental plots and modeled plots. The values of pre-exponential factor A of the three stages were obtained on the basis of Ea and the reaction mechanisms.