Electronic device, dielectric ceramic composition and the production method

A production method of a dielectric ceramic composition comprising

• a main component including a compound having a perovskite-type crystal structure expressed by a general formula ABO3, wherein “A” is Ba alone or a composite of Ba and Ca, and “B” is Ti alone or a composite of Ti and Zr,
• a fourth (a) subcomponent including an oxide of R1, wherein R1 is at least one selected from 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 R2, wherein R2is at least one selected from rare-earth elements having an effective ionic radius for coordination number 9 of 108 pm to 113 pm;
• comprising steps of:
• dividing a material of said main component to two as a material of a first main component and a material of a second main component,
• obtaining a post-reaction material by bringing the material of said first 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 the material of said second main component and 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 (M2/M1) of number of moles M2 of R2 of said fourth (b) subcomponent to number of moles M1 of R1 of said fourth (a) subcomponent in said dielectric ceramic composition to be obtained finally satisfies 0≦M2/M1≦25, and
• when number of moles of said first main component is n1 mole and number of moles of said second main component is n2, a ratio of said first main component to total number of moles of said first main component and said second main component is 0.75≦n1/(n1+n2)≦0.90.