| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition for producing dielectric porcelain, sinterable at low temperatures, having a high relative permittivity in a high-frequency band and a high value of Q with a small rate of change in resonant frequency with temperature by blending a perovskite compound having a compositional formula represented by (Sra Bab Cac )(Zrd Tie )O3 with prescribed amounts of Bi2 O3 and PbO. SOLUTION: This composition for producing a dielectric porcelain is obtained by blending 100wt.% perovskite compound represented by the compositional formula, (Sra Bab Cac )(Zrd Tie )O3 [(a+b+c) is 1; (d+e) is 1; 0<=(a), (b) and (c)<=1, 0<(d)<1; 0<=(e)<=0.5] with 0.5-30wt.% Bi2 O3 and 0-30wt.% PbO. The composition is based on SrZrO3 , BaZrO3 and CaZrO3 and is prepared by respectively replacing parts of Sr, Ca and Br with Ca, Sr and Ba (one or more thereof) or a part of Zr with Ti in order to reduce the rate of change in resonant frequency for temperature change. When the content of the Ti replacing the Zr is >=50mol%, the rate of change in resonant frequency with temperature cannot be reduced. Even a conventionally well-known additive can be added thereto. |
