Speaker
Description
In this research, the (Ba0.90Ca0.10)0.90(Na0.5Bi0.5)0.10TiO3 or BCT-NBT ceramics prepared by mixed oxide method with various sintering temperatures were investigated. The optimum calcination condition was found at 850oC for 4 h. These powders were pressed and sintered at 1000-1400oC for 3 h with a heating rate of 5oC/min. The microstructure was examined by scanning electron microscope (SEM). Density of the sintered samples was measured by Archimedes method with distilled water as the fluid medium. Dielectric properties at room temperature were examined by LCR meter. The results showed that, the average grain sizes were increased with increasing sintering temperatures, The sintering temperature at which the density, dielectric properties are optimum is 1300oC. The density was about 5.4 g/cm3, the dielectric constant at room temperature was 513 and dielectric loss was 0.03 at 1 kHz frequency.
Keywords: BCT-NBT ceramics, mixed oxide method, dielectric properties
