Microwave dielectric ceramic composition

Details Microwave dielectric ceramic composition Microwave dielectric ceramic composition

1994-11-16

1995-08-22

Brunsman, David

Compositions: ceramic

Ceramic compositions

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

C04B 3526

Patent

active

054440289

ABSTRACT:
In order to obtain a microwave dielectric ceramic composition having a high dielectric constant (.epsilon.r) and a large Q value and having a temperature coefficient of resonance; frequency (.tau.f) which is close to zero, the present invention is directed to a microwave dielectric ceramic composition expressed by a composition formula of w.multidot.Li.sub.2 O-x.multidot.CaO-y.multidot.A.sub.2 O.sub.3 -z.multidot.TiO.sub.2, wherein w, x, y and z are respectively in the ranges of 0.0 mole %<w.ltoreq.25.0 mole %, 0.0 mole %.ltoreq.x.ltoreq.50.0 mole %, 0.0 mole %<y.ltoreq.30.0 mole %, 0.0 mole %<z.ltoreq.80.0 mole % where w+x+y+z=100 mole %, and not more than 5 parts by weight of any one of ZnO, CoO, NiO and MgO is contained therein, and wherein A is selected from Sm and Nd.

REFERENCES:
patent: 5188993 (1993-02-01), Takahashi et al.

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