Abstract
In this work, dense calcium titanate ferroelectric ceramics were successfully synthesized using the combustion technique. Urea, glycine and the mixture of urea-glycine were selected as fuels and added to the mixed powders to accelerate the chemical reaction of raw materials. The mixtures were calcined and sintered from 600 to1150°C and 1150 to 1450°C, respectively. The effects of firing temperatures on the phase formation, crystal structure, microstructure, density and dielectric properties of the prepared samples were investigated. The X-ray diffraction patterns exhibited a pure perovskite structure which was identified for the glycine and urea-glycine mixed samples calcined at 1000°C for 2 h. The calcined powders exhibited an irregular shape and a wide range of particle size distribution at a low calcination temperature. By increasing the calcination temperature, the average particle size tended to increase and the samples expressed a more spherical shape which decreased the particle size distribution. The microstructure, density and dielectric properties results demonstrated that the optimum sintering temperature was 1400°C. The ceramic sintered at this temperature showed dielectric constant and loss of 194 and 0.004, respectively.
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