SINTERING AND DIELECTRIC-PROPERTIES OF HYDROTHERMALLY SYNTHESIZED CUBIC AND TETRAGONAL BATIO3 POWDERS

The sintering behavior of hydrothermally synthesized cubic and tetrago nal BaTiO3 powders was studied as a function of temperature. In additi on, the dielectric properties of the sintered samples were examined fr om room temperature to 200 degrees C at a frequency of 1 kHz. The infl uence of powder characteristics and sintering temperature on the micro structure development and dielectric properties were investigated. it was found that tetragonal powders showed limited grain growth and high er final density upon sintering, whereas the cubic powder exhibited ab normal grain growth and lower density, This was attributed to more dis perse and homogeneous particles in the tetragonal powders with fewer d efects, as compared to the cubic powder. Correlations between the micr ostructure and the dielectric properties were developed. As expected, samples with finer grain size and higher density exhibited higher diel ectric constant and lower loss.