Patent ID: 7509717

Claim:
A method of production of a multilayer ceramic electronic device having dielectric layers with an interlayer thickness of 5 Î¼m or less after firing and internal electrode layers including a base metal, comprising: a step of preparing a stack comprised of 100 layers or more of alternate dielectric layer paste and internal electrode layer paste a base metal, a step of firing, then annealing the stack under a reducing atmosphere, a step of first heat treatment of said annealed stack under a strong reducing atmosphere of an oxygen partial pressure P 3 of over 2.9Ã—10 âˆ’39 Pa to less than 6.7Ã—10 âˆ’24 Pa and a holding temperature T 3 of over 300Â° C. to less than 600Â° C., and then followed by a step of second heat treatment of said first heat treated stack under an atmosphere of an oxygen partial pressure P 4 of over 1.9Ã—10 âˆ’7 Pa to less than 4.1Ã—10 âˆ’3 Pa and a holding temperature T 4 of over 500Â° C. to less than 1000Â° C., wherein said dielectric layer paste has a barium titanate material having an average particle size of 0.1 to 1.0 Î¼m, a glass ingredient material, and an additive ingredient material; said glass ingredient material has a Ba compound and/or Ca compound and Si compound; and said additive ingredient material has an Mg compound, an Mn compound, one type or two types of compounds or more selected from a V compound, W compound and Mo compound, and an R compound is one or more types of elements selected from Y, Sc, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and Tb when the barium titanate material is converted to BaTiO 3 , the Ba compound to BaO, the Ca compound to CaO, the Si compound to SiO 2 , the Mg compound to MgO, the Mn compound to MnO, the V compound to V 2 O 5 , the W compound to WO 3 , the Mo compound to MoO, and the R compound to R 2 O 3 , the ratio to BaTiO 3 : 100 mol is Ba compound+Ca compound: 0.1 to 12 mol, Si compound: 0.1 to 12 mol, Mg compound: 3 mol or less, excluding 0 mol, Mn compound: 0.5 mol or less, excluding 0 mol, V compound+W compound+Mo compound: 0.3 mol or less, excluding 0 mol, R compound: 0.02 to 5 mol.