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    • 6. 发明授权
    • Dielectric ceramic, method for producing the same, laminated ceramic electronic element, and method for producing the same
    • 介电陶瓷,其制造方法,层叠陶瓷电子元件及其制造方法
    • US06205015B1
    • 2001-03-20
    • US09233335
    • 1999-01-20
    • Nobuyuki WadaJun IkedaTakashi HiramatsuYukio Hamaji
    • Nobuyuki WadaJun IkedaTakashi HiramatsuYukio Hamaji
    • H01G406
    • H01G4/1227C04B35/4682
    • A dielectric ceramic which exhibits an excellent electrostatic capacity-temperature characteristic; which allows use of a base metal such as nickel; which can be fired in a reducing atmosphere; and which is suitable for constituting a dielectric ceramic layer of a laminated ceramic electronic element such as a laminated ceramic capacitor; is obtained by firing barium titanate powder in which the c-axis/a-axis ratio in the perovskite structure is in the range of about 1.003 to 1.010 and the amount of OH groups in the crystal lattice is about 1 wt. % or less. The barium titanate powder a starting material preferably has a maximum particle size of about 0.5 &mgr;m or less and an average particle size of about 0.1-0.3 &mgr;m, and individual particles of the barium titanate powder comprise a low-crystallinity portion 21 and a high-crystallinity portion 23, with the diameter of the low-crystallinity portion being less than about 0.65 times the particle size of the powder. When sintered, the powder satisfies the ratio of (average grain size of the fired dielectric ceramic)/(average particle size of barium titanate powder serving as a starting material), which is referred to as R, of about 0.90-1.2, to thereby suppress considerable grain growth. A laminated ceramic electronic element including a laminate of a plurality of layers of the above-mentioned dielectric ceramic, as well as a method for producing the same, is described.
    • 表现出优异的静电电容 - 温度特性的介电陶瓷; 其允许使用诸如镍的贱金属; 可在还原气氛中燃烧; 适用于层叠陶瓷电容器等层叠陶瓷电子元件的介电陶瓷层的构成; 是通过煅烧其中钙钛矿结构中的c轴/ a轴比在约1.003至1.010的范围内并且晶格中的OH基的量为约1重量%的钛酸钡粉末而获得的。 % 或更少。 作为起始原料的钛酸钡粉末的最大粒径优选为0.5μm以下,平均粒径为0.1〜0.3μm左右,钛酸钡粉末的单个粒子为低结晶性部21, 结晶度部分23,低结晶度部分的直径小于粉末粒度​​的约0.65倍。 当烧结时,粉末满足作为R的(烧结后的电介质陶瓷的平均粒径)/(作为原料的钛酸钡粉末的平均粒径)为约0.90〜1.2的比例,由此 抑制可观的粮食增长。 描述了包括上述介电陶瓷的多层的叠层体的层压陶瓷电子元件及其制造方法。