Dielectric ceramic composition and electronic component

Details Dielectric ceramic composition and electronic component Dielectric ceramic composition and electronic component

2010-02-03

2011-11-08

Group, Karl (Department: 1731)

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

Reexamination Certificate

active

08053385

ABSTRACT:
The dielectric ceramic composition comprising a main component including a compound satisfying a compositional formula of (SrxBa1-x)mTiO3(“x” in said compositional formula is 0.159≦“x”≦0.238, and “m” is 0.997≦“m”≦1.011), and a subcomponent comprising 11 to 25 weight % of CaTiO3, 0.10 to 0.50 weight % of at least one oxide of element selected from the group consisting of Fe, Co, Ni, Cu, and Zn in terms of FeO3/2, CoO4/3, NiO, CuO, and ZnO, 0.590 to 1.940 mol % of an oxide of element “A” (A is Mn and/or Cr), and an oxide of element “D” where “D” is at least one element selected from a group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, and Y; wherein a ratio (A/D) of the element “A” with respect to element “D” is 2.250 to 7.450. According to the present invention, the dielectric loss (tan δ) at the wide frequency range can be lowered while maintaining a good capacitance temperature characteristic and the specific permittivity, without including Pb and bismuth Bi.

REFERENCES:
patent: 6429163 (2002-08-01), Kim et al.
patent: 6451721 (2002-09-01), Kawabata et al.
patent: 7022635 (2006-04-01), Wang et al.
patent: 7528088 (2009-05-01), Umeda et al.
patent: A-2003-238240 (2003-08-01), None
patent: B2-3767377 (2006-04-01), None

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