Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7997573 | Journal of Alloys and Compounds | 2016 | 40 Pages |
Abstract
(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; ÎH* = 120.57 kJ/mol, ÎG* = 282.94 kJ/mol and ÎS* = â223.93 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 Ã ÆÂ = 15730 and ÏÆÂ = +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.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Abdul Naeem, Asad Ullah, Yaseen Iqbal, Tahira Mahmood, Asad Mahmood, Zulfiqar Ali Raza,