Synthesis, kinetic analysis and electrical characterization of (Ca0.8Sr0.2)0.6La0.267TiO3 by polymeric precursor method

(Ca0.8Sr0.2)0.6La0.267TiO3 microwave dielectric ceramic was synthesized by a polymeric precursor method. The kinetic and thermodynamic parameters of the reaction were determined by a non-isothermal method. The activation energy of thermal decomposition of the polymeric precursor was found to be 70.97 ± 5.67 kJ/mol and 63.62 ± 6.03 kJ/mol using FWO and KAS models respectively. The average values of thermodynamic parameters were; ΔH* = 120.57 kJ/mol, ΔG* = 282.94 kJ/mol and ΔS* = −223.93 J/mol K. The particle size of the synthesized powder was <100 nm with orthorhombic (Pbnm) symmetry. The sintered ceramic exhibited εr = 116.2, Q × ƒ = 15730 and τƒ = +231 ppm/°C. Analysis of impedance data obtained in the temperature range 200-500 °C revealed that the ceramic exhibited negative temperature coefficient resistor (NTCR) characteristics.