Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Reexamination Certificate
2011-01-18
2011-01-18
Ha, Nguyen T (Department: 2835)
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
C361S321200, C361S321400, C361S311000, C361S312000, C361S313000
Reexamination Certificate
active
07872854
ABSTRACT:
A semiconductor ceramic comprising a donor element within the range of 0.8 to 2.0 mol relative to 100 mol of Ti element contained as a solid solution with crystal grains, a first acceptor element in an amount less than the amount of the donor element is contained as a solid solution with the crystal grains, a second acceptor element within the range of 0.3 to 1.0 mol relative to 100 mol of a Ti element is present in crystal grain boundaries, and the average grain size of the crystal grains is 1.0 μm or less. A monolithic semiconductor ceramic capacitor is obtained by using this semiconductor ceramic. To form the semiconductor ceramic, in a first firing treatment to conduct reduction firing, a cooling treatment is conducted while the oxygen partial pressure at the time of starting the cooling is set at 1.0×104times or more the oxygen partial pressure in the firing process. In this manner, a SrTiO3based grain boundary insulation type semiconductor ceramic having a large apparent relative dielectric constant ∈rAPPof 5,000 or more and a large resistivity log ρ (ρ: Ω·cm) of 10 or more even when crystal grains are made fine to have an average grain size of 1.0 μm or less, a monolithic semiconductor ceramic capacitor including the semiconductor ceramic, and methods for manufacturing them are realized.
REFERENCES:
patent: 6359327 (2002-03-01), Niimi et al.
patent: 6385035 (2002-05-01), Matoba et al.
patent: 6437970 (2002-08-01), Lee et al.
patent: 6556423 (2003-04-01), Konaka et al.
patent: 6984355 (2006-01-01), Niimi et al.
patent: 7154736 (2006-12-01), Kirsten
patent: 7583493 (2009-09-01), Tani et al.
patent: 1063204 (1989-03-01), None
patent: 11302072 (1999-11-01), None
patent: 10-2000-0076768 (2000-12-01), None
Dickstein & Shapiro LLP
Ha Nguyen T
Murata Manufacturing Co. Ltd.
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