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    • 3. 发明授权
    • Dielectric ceramic compositions
    • 介电陶瓷组合物
    • US5635435A
    • 1997-06-03
    • US634150
    • 1996-04-19
    • Masamitsu Shibata
    • Masamitsu Shibata
    • C04B35/46C04B35/468H01B3/12H01G4/12C03C14/00
    • C04B35/468H01B3/12H01G4/1227
    • A dielectric ceramic composition having about 97.5 to 99.95 wt % of a main component and 0.05 to 2.5 wt % of a first subcomponent, the main component having the following general formula:{100-(a+b+c+d+e)}BaTiO.sub.3 +aBi.sub.2 O.sub.3 +bNb.sub.2 O.sub.5 +cMxO+dMyO.sub.2 +eMz,wherein Mx is at least one element selected from the group consisting of Mg, Ca and Zn; My is at least one element selected from the group consisting of Ti, Sn and Zr; Mz is at least one oxide of an element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Dy, Ho and Er; and a, b, c, d, and e are mole % and are in the following ranges: 1.0.ltoreq.a.ltoreq.6.0, 0.5.ltoreq.b.ltoreq.4.5, 0.ltoreq.c.ltoreq.4.0, 1.5.ltoreq.d.ltoreq.15.0, and 0.5.ltoreq.e.ltoreq.5.5; and the first subcomponent comprising a glass mainly containing SiO.sub.2. The composition can be subjected to firing at 1,160.degree. C. or less; satisfies the X8R characteristic of the EIA standard in spite of a high dielectric constant of 1,000 or more; and exhibits a small change rate of the electrostatic capacitance toward the temperature when a bias dc voltage is applied thereto.
    • 主要成分为主成分为97.5〜99.95重量%,第一副成分为0.05〜2.5重量%的电介质陶瓷组合物,其主成分具有以下通式:{100-(a + b + c + d + e)} BaTiO3 + aBi2O3 + bNb2O5 + cMxO + dMyO2 + eMz,其中Mx是选自Mg,Ca和Zn中的至少一种元素; 我是选自Ti,Sn和Zr中的至少一种元素; Mz是选自Y,La,Ce,Pr,Nd,Sm,Dy,Ho和Er中的元素的至少一种氧化物; 和a,b,c,d和e是摩尔%,并且在以下范围内:1.0