Thermal decomposition kinetics of ammonium uranyl carbonate

Abstract

The thermal decomposition kinetics of AUC [ammonium uranyl carbonate; (NH4)4UO2(CO3)3] in an isothermal thermogravimetric (TG) reactor under N2 atmosphere has been determined. The kinetic data can be represented by the two-dimensional nucleation and growth mode!. The reaction rate increases and activation energy decreases with increasing particle size and precipitation time which appears in the particle size larger than 30 mum in the mechano-chemical phenomena.