DIELECTRIC-PROPERTIES AND FERROELECTRIC DOMAIN OF BATIO3 POWDERS

A systematic study of the particle size dependence of the ferroelectric domain, internal stress and dielectric constant (K) of BaTiO3 powders was performed using scanning electron microscopy, X-ray diffractometer and differential scanning calorimetry. The dielectric constant of BaTiO3 powder was lower than that of the BaTiO3 sintered body. Low values of the dielectric constant were observed for BaTiO3 powder, which was ascribed to low domain density and constrained forces existing in the particles. As the particles became smaller due to the decrease in the constrained force powders of lower domain density are formed.