Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1991-10-17
1993-01-19
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
29 2542, H01G 410, H01G 700
Patent
active
051811570
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a ceramic capacitor having a one-layer structure or a laminated structure in which one or more than one dielectric ceramic layer is (are) sandwiched between internal electrodes, and a method for fabricating the same.
BACKGROUND OF THE INVENTION
In a conventional method for fabricating a laminated ceramic capacitor, a desired pattern of conductive paste consisting mainly of noble metal such as platinum (Pt) or palladium (Pd) is printed on a non-sintered ceramic sheet (green sheet) consisting of dielectric ceramic material powder. Then, a plural number of the green sheets are laminated and attached each other, and the laminated green sheets are fired at a temperature in the range of 1300.degree. C. to 1600.degree. C. under an oxidation atmosphere.
The non-sintered ceramic sheets consisting of dielectric ceramic sheets consisting of dielectric ceramic material powder become dielectric ceramic layers by firing the sheets, and the conductive paste consisting mainly of noble metal such as platinum or palladium become internal electrodes.
As described above, by adopting the conductive paste consisting mainly of noble metal such as platinum or palladium, a desired internal electrode can be obtained without oxidation thereof even if the material thereof is fired at a high temperature in the range of 1300.degree. C. to 1600.degree. C. under an oxidation atmosphere.
However, noble metals such as platinum or palladium are expensive, so that the laminated ceramic capacitors become essentially costly.
In order to resolve the problem described above, the applicant of the present invention has proposed in Japanese Patent Publication No. 61-14607, in which dielectric ceramic compositions including basic components consisting of (Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2 (M is Mg and/or Zn) and additional components consisting of Li.sub.2 O and SiO.sub.2 are disclosed.
Japanese Patent Publication No. 61-14608 has disclosed dielectric ceramic compositions including additional components consisting of Li.sub.2 O, SiO.sub.2 and MO (MO is one or more than one kind of metal oxides selected from a group consisting of BaO, CaO and SrO) instead of Li.sub.2 O and SiO.sub.2 in the cited reference No. 61-14607.
Japanese Patent Publication No. 61-14609 has disclosed dielectric ceramic compositions consisting of basic components consisting of (Ba.sub.k-x-y M.sub.x L.sub.y) O.sub.k TiO.sub.2 (M is Mg and/or Zn, and L is Sr and/or Ca) and additional components consisting of Li.sub.2 O and SiO.sub.2.
Japanese Patent Publication No. 61-14610 has disclosed dielectric ceramic compositions including additional components consisting of Li.sub.2 O, SiO.sub.2 and MO (MO is one or more than one kind of metal oxides selected from a group consisting of BaO, CaO and SrO) instead of Li.sub.2 O and SiO.sub.2 in the cited reference No. 61-14609.
Japanese Patent Publication No. 61-14611 has disclosed dielectric ceramic compositions consisting of basic components consisting of (Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2 (M is one or more than one kind of metals selected from a group consisting of Mg, Zn, Sr and Ca) and additional components consisting of B.sub.2 O.sub.3 and SiO.sub.2.
Japanese Patent Publication No. 62-1595 has disclosed dielectric ceramic compositions consisting of basic components consisting of (Ba.sub.k-x M.sub.x)O.sub.k TiO.sub.2 (M is one or more than one kind of metals selected from a group consisting of Mg, Zn, Sr and Ca) and additional components consisting of B.sub.2 O.sub.3 and MO (MO is one or more than one kind of metal oxides selected from a group consisting of BaO, MgO, ZnO, SrO and CaO).
Japanese Patent Publication No. 62-1596 has disclosed dielectric ceramic compositions including additional components consisting of B.sub.2 O.sub.3, SiO.sub.2 and MO (MO is one or more than one kind of metal oxides selected from a group consisting of BaO, MgO, ZnO, SrO and CaO) instead of B.sub.2 O.sub.3 and MO in the cited reference No. 62-1595.
By using one of the dielectric ceramic compositions di
REFERENCES:
patent: 5075819 (1991-12-01), Saito et al.
patent: 5077636 (1991-12-01), Saito et al.
Chazono Hirokazu
Honda Mutsumi
Kisi Hirosi
Saito Hirosi
Shizuno Hisamitsu
Banta Teresa J.
Griffin Donald A.
Snider Ronald R.
Taiyo Yuden Kabusikigaisha
Townsend Donald E.
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