BATIO3 PARTICLE-SIZE DEPENDENCE OF FERROELECTRICITY IN BATIO3 POLYMERCOMPOSITES

BaTiO3 particle-size dependence of ferroelectricity in BaTiO3/polymer composites was investigated from the viewpoints of the crystal phase i n BaTiO3 powder and piezoelectric properties in BaTiO3/polymer composi tes. The crystal phase of BaTiO3 powder was transformed from tetragona l to pseudocubic at a critical particle size of 0.1 to 0.2 mum at room temperature. The piezoelectric charge constant (d33) and hydrostatic piezoelectric constant (d(h)) were obtained through poling treatment, although their values were small in BaTiO3/polymer composite using the pseudocubic BaTiO3 powder.