Piezoelectric ceramic composition
    2.
    发明授权
    Piezoelectric ceramic composition 失效
    压电陶瓷组合物

    公开(公告)号:US4761242A

    公开(公告)日:1988-08-02

    申请号:US867953

    申请日:1986-05-29

    CPC分类号: H01L41/187 C04B35/475

    摘要: A piezoelectric ceramic composition is disclosed wherein a sintered body having a bismuth layer structure represented by a molecular formula of PbBi.sub.4 Ti.sub.4 O.sub.15 contains 10 to 55 mol % of an oxide of Ca and Ti, namely CaTiO.sub.3, or 1 to 15 mol % of an oxide of Sr and Ti, namely, SrTiO.sub.3. The bismuth layer structure of PbBi.sub.4 Ti.sub.4 O.sub.15 has a positive dielectric-constant-temperature characteristic, and CaTiO.sub.3 or SrTiO.sub.3 is obtained by sintering as an added substance exhibiting a negative dielectric-constant-temperature characteristic. Since the added substance is added to the piezoelectric ceramic composition so that the temperature changes in both dielectric constants are mutually cancelled out, thereby maintaining the piezoelectric constants at a substantially fixed level.

    摘要翻译: 公开了一种压电陶瓷组合物,其中具有由PbBi 4 Ti 4 O 15分子式表示的铋层结构的烧结体含有10至55mol%的Ca和Ti的氧化物即CaTiO 3或1至15mol%的Sr的氧化物 和Ti,即SrTiO3。 PbBi4Ti4O15的铋层结构具有正的介电常数温度特性,通过烧结作为显示出负介电常数温度特性的附加物质获得CaTiO 3或SrTiO 3。 由于将添加的物质添加到压电陶瓷组合物中,使得两个介电常数中的温度变化相互抵消,从而将压电常数保持在基本固定的水平。