Patent ID: 7718560

Claim:
A production method of a dielectric ceramic composition comprising a main component including a compound having a perovskite-type crystal structure expressed by a composition formula (Ba 1-x Ca x )(Ti 1−y Zr)O 3 , wherein 0≦x≦0.2, 0≦y≦0.2, a fourth (a) subcomponent including an oxide of R 1 , wherein R 1 is at least one selected from the group consisting of rare-earth elements having an effective ionic radius for coordination number 9 of less than 108 pm, and a fourth (b) subcomponent including an oxide of R 2 , wherein R 2 is at least one selected from the group consisting of rare-earth elements having an effective ionic radius for coordination number 9 of 108 pm to 113 pm; comprising steps of: obtaining a post-reaction material by bringing a material of said main component to react with a part of a material of said fourth (a) subcomponent and/or a part of a material of said fourth (b) subcomponent to be included in said dielectric ceramic composition in advance of a step of firing; obtaining a material of said dielectric ceramic composition by adding rest of materials of said fourth (a) subcomponent and said fourth (b) subcomponent to be included in said dielectric ceramic composition into said post-reaction material; and firing said material of said dielectric ceramic composition, wherein a ratio (M 2 /M 1 ) of number of moles M 2 of R 2 of said fourth (b) subcomponent to number of moles M 1 of R 1 of said fourth (a) subcomponent in said dielectric ceramic composition to be obtained finally satisfies 0.03≦M 2 /M 1 ≦0.25, wherein in said step for obtaining the post-reaction material, a content of said fourth (a) subcomponent and/or said fourth (b) subcomponent to be brought to react with the materials of said main component is 0.05 to 0.4 mole in terms of R 1 and/or R 2 with respect to 100 moles of said main component.