Abstract
The kinetics of formation of lanthanum tellurate (La2TeO6) in the temperature range 1023–1203 K was studied by means of thermogravimetric (TG) technique. La2TeO6 was formed by heating a stoichiometric mixture of La(OH)3 and TeO2 in a stream of pure oxygen. The kinetics of formation was studied by carrying out the TG experiments under isothermal and non-isothermal conditions. Model-free isoconversional method was employed to derive the kinetic parameters and to establish the dependence of effective activation energy on progress of the formation reaction. The effective activation energy for the formation of La2TeO6 obtained using model-free method varied from 335 to 790 kJ mol−1 during the progress of this reaction. The mechanism of formation of La2TeO6 was ascertained using model-based method.
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