Kinetics of the decomposition of LiMn2O4 in air

In order to get the decomposition kinetics of LiMn2O4 in air, its decomposition process was studied with TG, XRD and H-E integrated equation. The decomposition reaction from 1070K to 1210K is LiMn2O4 (Cubic) -> 4LiMn(2)O(4-delta) (Orthorhombic) + delta/2O(2)(g)up arrow, which is controlled by nucleating and growing, and the activated energy is 204.16kJ/mol. The reaction from 1210K to 1473K is 3LiMn(2)O(4-delta)(Orthorhombic) -> LiMnO2 + Mn3O4 + Li2Mn2O4 + (1-3 delta/2)O-2(g)up arrow. Nucleating and growing is the key step of the process from 1210K to 1300K, and its activated energy is 185.61 kJ/mol. But the process from 1300K to 1473K is controlled by diffusion, and its activated energy is 208.74 kJ/mol. The kinetical compensative effects riot only exist in Arrhenius equation but also in Harcourt-Esson equation.