| 摘要 |
<p>A ceramic material comprising a composition expressed by the following formula as (1-x)(Pb1-a-bBaaSrb) {(Zn1/3Nb2/3)1-c-d(Mg1/3Nb2/3)cTid}O3.xBaTiO3 where 0 </= a </= 0.35 0 </= b </= 0.35 0.01 </= a+b </= 0.35 0 </= c </= 0.9 0 < d </= 0.5 0 < c+d < 1.0 0.3 </= x </= 0.65 having a high dielectric constant (K = 2300 to 7000), a high insulation resistance (CR = 4000 to 18000 ohmF), a low temperature dependence (+/-10%) to (+/-22, -33%) upon dielectric constant over a wide temperature range (-55 and +125 DEG C) and a relatively low sintering temperature (1000 DEG C to 1250 DEG C) is disclosed. It is manufactured when BaTiO3 powder (at least 50 wt% of which is 0.7 to 3 mu m in particle size) is mixed with another compound with perovskite structure mainly composed of oxides of Pb, Ba, Sr, Zn, Nb, Mg and Ti before sintering. Further, part of Ti of BaTiO3 is substitutable with Zr or Sn, and part of Ba of BaTiO3 is sustitutable with Sr, Ca or Ce.</p> |
