Dielectric powder composition for multi-layered ceramic capacitor and manufacturing method thereof

A method of manufacturing a dielectric powder composition for multilayer ceramic capacitors (MLCC), the method comprising:

• preparing non-stoichiometric dielectric starting powder using a solid state method;
• preparing glass powder to match a stoichiometric composition to the non-stoichiometric dielectric starting powder;
• mixing the non-stoichiometric dielectric starting powder with the glass powder, followed by heat-treatment through rapid heating to coat the outer periphery of the non-stoichiometric dielectric starting powder with a glass frit to form core-shell structure dielectric powder;
• and
• adding transition metal oxide powder to the core-shell structure dielectric powder to prepare a dielectric powder composition, wherein
• the dielectric powder composition comprises:
• 93 to 98.5 wt % of a main ingredient including the non-stoichiometric dielectric starting powder;
• 1.0 to 5.0 wt % of a first sub-ingredient including the glass powder;
• and 0.5 to 2.0 wt % of a second sub-ingredient including the transition metal oxide, wherein
• the main ingredient is non-stoichiometrically represented as [(BaxCaySr1-x-y)O]m[(TizZr1-z) O2](where x ranges from 0.22 to 0.42, y ranges from 0.10 to 0.35, z ranges from 0.03 to 0.08, and m ranges from 0.85 to 1.05),
• the first sub-ingredient includes an alkaline earth metal compound including (Ba, Sr, Ca), SnO2, B2O3 and SiO2, and
• the second sub-ingredient includes at least two selected from the group consisting of manganese oxide (Mn3O4), tungsten oxide (WO3), and aluminum oxide (Al2O3).