Patent ID: 7585802

Claim:
A method of production of a dielectric ceramic composition comprised of at least dielectric particles having barium titanate as its main ingredient comprising steps of: preparing a dielectric material including barium titanate as main ingredient, at least one oxide selected from MgO, CaO, BaO, and SrO as a first sub ingredient, silicon oxide as its main ingredient as a second sub ingredient, at least one oxide selected from V 2 O 5 , MoO 3 , and WO 3 as a third sub ingredient, an oxide of R1 (wherein R1 is at least one element selected from Sc, Er, Tm, Yb, and Lu) as a fourth sub ingredient, CaZrO 3 or CaO+ZrO 2 as a fifth sub ingredient, an oxide of R2 (wherein R2 is at least one element selected from Y, Dy, Ho, Tb, Gd, and Eu) as a sixth sub ingredient and MnO as a seventh sub ingredient; dividing said dielectric material into at least two; calcining the divided dielectric materials under different conditions; mixing the calcined dielectric materials; and firing the mixed calcined dielectric materials; wherein the ratio of dielectric particles having a surface diffusion structure including a main ingredient phase comprised of the main ingredient and a diffusion phase present around the main ingredient phase with respect to all of said dielectric particles is 60% or more and the ratio of dielectric particles having a domain in the main ingredient phase with respect to the dielectric particles having the surface diffusion structure is 20% or less.