Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1996-06-13
1997-05-13
Jones, Deborah
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
3613212, 3613215, C04B 3546, H01G 412
Patent
active
056292520
ABSTRACT:
A dielectric ceramic composition that can be sintered at a low temperature of around 1000.degree. C. and also can have a high dielectric constant, a high Q value and small temperature coefficient at a resonant frequency includes a glass component that promotes sintering. The dielectric ceramics include: the main component comprising calcium oxide, magnesium oxide, niobium oxide and titanium oxide and expressed by the Formula: Ca{(Mg.sub. 1/3 Nb.sub. 2/3).sub.1-x Ti.sub.x }O.sub.3 (wherein X is more than 0 not more than 0.50) within the range of not less than 40 parts by weight nor more than 98 parts by weight; the accessory component comprising at least one selected from SiO.sub.2 and B.sub.2 O.sub.3 within the range of not less than 2 parts by weight nor more than 60 parts by weight; and at least one oxide selected from the group consisting of MgO, NiO, CuO, MNO.sub.2 and WO.sub.3 within the range of not less than 0.1 parts by weight nor more than 10 parts by weight. Consequently, the dielectric ceramic composition of the present invention can be sintered at low temperature. The dielectric ceramic composition also has a stability in composition and high Q value, which can used for the dielectric ceramic and multilayer high frequency device.
REFERENCES:
patent: 5248640 (1993-09-01), Sano et al.
patent: 5273944 (1993-12-01), Kagata et al.
patent: 5484753 (1996-01-01), Kagata et al.
patent: 5525562 (1996-06-01), Kagata et al.
Inoue Tatsuya
Kagata Hiroshi
Kato Jun-ichi
Nishimoto Keiji
Jones Deborah
Matsushita Electric - Industrial Co., Ltd.
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