Kinetic analysis on the synthesis of Mg0.95Zn0.05TiO3 microwave dielectric ceramic by polymeric precursor method. Issue 10 (December 2015)

• Record Type: Journal Article
• Authors: Ullah, Asad; Iqbal, Yaseen; Mahmood, Tahira; Mahmood, Asad; Naeem, Abdul; Hamayun, Muhammad
• Is Part Of: Ceramics international. Volume 41:Issue 10(2015)Part B
• Page Start: 15089
• Page End: 15096
• Publication Date: 2015-12
• Subjects: Titanate -- Polymeric precursor -- Non-isothermal kinetics -- Microwave dielectric; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.08.075
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Thermo gravimetric-differential scanning calorimetry (TG-DSC) was used to analyze the thermal decomposition of polymeric precursor of Mg0.95 Zn0.5 TiO3 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 Mg0.95 Zn0.5 TiO3 are discussed.