Dielectric ceramic composition

Details Dielectric ceramic composition Dielectric ceramic composition

1987-06-12

1988-05-24

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

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

C04B 3546, C04B 3550

Patent

active

047466391

ABSTRACT:
A dielectric ceramic composition consists essentially of a basic component composed of 35 to 70 wt % of SrTiO.sub.3, 0.5 to 16 wt % of MgTiO.sub.3, 1.0 to 12 wt % of CaTiO.sub.3, 5 to 32 wt % of Bi.sub.2 O.sub.3 and 5 to 16 wt % of TiO.sub.2, and additives composed of CuO, MnO.sub.2 and CeO.sub.2. The contents of the additives per 100 parts by weight of the main component are 0.05 to 1.0 parts by weight for CuO, 0.02 to 0.5 parts by weight for MnO.sub.2, and 1.0 to 8.0 parts by weight for CeO.sub.2, respectively. The composition possesses a high dielectric constant of more than 500, a high Q value of more than 1000 at 1 MHz, a small temperature change rate of capacitance of a maximum of -7.2% at +85.degree. C., and a small change rate of capacitance with direct current voltage.

REFERENCES:
patent: 4388416 (1983-06-01), Sakabe et al.
patent: 4482934 (1984-11-01), Hirota et al.
patent: 4485181 (1984-11-01), Sakabe et al.
patent: 4552853 (1985-11-01), Kawabata et al.

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