The Effect of Firing Temperatures on (Pb0.75Ba0.25)( Zr0.70Ti0.30)O3 Ceramics Prepared via the Combustion Technique

The (Pb0.75Ba0.25)(Zr0.70Ti0.30)O-3 (PBZT) ceramics were prepared via the combustion technique. (CO(NH2)(2)) was used as a fuel. The effect of firing temperature on PBZT's phase formation, microstructure and electrical properties were investigated. The calcination and sintering temperatures were 600 degrees C-1000 degrees C and 1100 degrees C-1300 degrees C. The pure rhombohedral perovskite was obtained from the powders calcined at 850 degrees C. The average particle size tended to increase with increased calcination temperatures. A pure rhombohedral perovskite phase was found in all pellet samples. The average grain size and linear shrinkage tended to increase from 0.57 to 2.15m and from 6.8 to 15.8% with increased sintering temperatures. The dielectric results indicated the relaxer behavior of PBZT ceramics. The Curie temperature tended to decrease with increasing sintering temperatures. The highest density (approximate to 7.39g/cm(3)) and highest dielectric constant (approximate to 8620) were obtained by using the combustion technique which was higher than the conventional mixed oxide method.