To improve the electrical properties of multilayer ceramic capacitors, triple (Mg/Dy/Si) oxides coating on the surfaces of 150- nm BaTiO3 (BT) particles was conducted by using the thermal hydrolysis method. Multi-layer (5 layers) ceramic capacitors (MLCCs) of triple oxides coated BT (TOBT) particles were obtained by using green sheet process and their electrical properties were measured. The MLCCs of TOBT particles gave a better stable dielectric constant and dissipation factor for the sintering temperature compared with those of the reference specimen prepared by using mixing process. In addition, a stable temperature coefficient of capacitance (TCC) was obtained. The morphology and homogeneity of TOBT particles were measured by using scanning transmission electron microscope-high angle annular dark field (STEM-HAADF) and energy dispersive X-ray spectroscopy (EDX).

Keywords: Thermal hydrolysis, SiO2, MgO, Dy2O3, BaTiO3, Multi layer, MLCC properties.