Kinetic analysis on the synthesis of Mg0.95Zn0.05TiO3 microwave dielectric ceramic by polymeric precursor method

Abstract Thermo gravimetric-differential scanning calorimetry (TG-DSC) was used to analyze the thermal decomposition of polymeric precursor of Mg 0.95 Zn 0.5 TiO 3 at different heating rates in the flow of air atmosphere. The kinetic parameters of the reaction were calculated using isoconversional methods. Three dimensional diffusion reaction (Jander); g ( α )=[1−(1− α ) 1/3 ] 2 was proposed mechanism function for the reaction. By using Flynn–Wall–Ozawa model the calculated values of the average activation energy, pre-exponential factor and order of the reaction were found to be 129.33 kJ/mol, 1.04×10 8 min −1 , and 2.00, respectively. Whereas in the Kissinger–Akahira–Sunose model corresponding values were 123.88 kJ/mol, 2.95×10 7 min −1 , and 2.09, respectively. The thermodynamic parameters such as enthalpy, Gibbs free energy and entropy of activation calculated at the peak temperature were noted to be 120.46 kJ/mol, 228.69 kJ/mol, and −146.63 J/mol K, respectively. Moreover, phase, microstructure and microwave dielectric properties of Mg 0.95 Zn 0.5 TiO 3 are discussed.