Effects of MgO coating on microstructure and dielectric properties of BaTiO3

Effects of MgO coating on microstructure and dielectric properties of BaTiO3 have been studied compared with mechanically MgO mixed BaTiO3. MgO-coated BaTiO3 particles were prepared by a homogeneous precipitation method using MgCl2·6H2O and urea. TEM micrograph showed homogeneous adsorption of MgO particles on the BaTiO3 surfaces. MgO coated and mixed samples showed different dielectric behaviors because uniformity of microstructures and shape of core-shell structure were different each other. Bulk density was slightly decreased with increasing MgO content. EPMA analysis indicates that microstructures and dielectric behaviors were affected by the distribution of MgO in the BaTiO3 matrix.