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    • 1. 发明授权
    • Piezoelectric ceramic composition reducing leakage current and piezoelectric device using the same
    • 压电陶瓷组合物减少泄漏电流和使用其的压电器件
    • US06656378B2
    • 2003-12-02
    • US10067814
    • 2002-02-08
    • Sang Koo KwonKang Heon HurJong Kuk HongDong Hwan Seo
    • Sang Koo KwonKang Heon HurJong Kuk HongDong Hwan Seo
    • H01L41187
    • C04B35/493C04B2235/3241C04B2235/3249C04B2235/3258C04B2235/3267C04B2235/3275C04B2235/3296H01L41/1876
    • Disclosed is a piezoelectric ceramic composition comprising a PZT piezoelectric composition, a B-site of which is substituted with a certain material, and chromium oxide, and a piezoelectric device using the piezoelectric ceramic composition. The piezoelectric ceramic composition has good heat resistance and frequency stability, and reduces a leakage current. There is provided the piezoelectric ceramic composition comprising a main component expressed by Pb[(Co1/2W1/2)xTi1−x−yZry]O3 (wherein, 0.001≦x≦0.04, and 0.35 ≦y≦0.55), Cr2O3 in an amount of 0.01 to 2 wt %, MnO2 in an amount of 0.1 to 0.5 wt %, and an additive in an amount of 0.01 to 2.0 wt %, based on the total weight of the piezoelectric ceramic composition, in which the additive is selected from the group consisting of CoO, MgO, ZnO, Al2O3, Fe2O3, Sb2O3, SnO2, CeO2, Nb2O5, V2O5 and WO3, and mixtures thereof. The piezoelectric ceramic composition satisfies piezoelectric properties such as kp and Qm needed for a piezoelectric material, and is 320° C. or higher in phase transition temperature, ±30 ppm/° C. in TCF, and 0.1% or less in oscillation frequency change after reflow; and the piezoelectric ceramic composition also has good piezoelectric properties such that the leakage current is reduced.
    • 本发明公开了一种压电陶瓷组合物和使用该压电陶瓷组合物的压电装置,其中PZT压电组合物的B部位用某种材料代替,氧化铬。 压电陶瓷组合物具有良好的耐热性和频率稳定性,并且减小了漏电流。 提供了包含由Pb [(Co1 / 2W1 / 2)xTi1-x-yZry] O3(其中0.001≤x≤0.04,0.35≤Y≤ 0.55)表示的主要成分的压电陶瓷组合物, 0.01〜2.0重量%的MnO 2,0.1〜0.5重量%的MnO 2,0.01〜2.0重量%的添加剂,相对于压电陶瓷组合物的总重量,添加剂为 选自CoO,MgO,ZnO,Al2O3,Fe2O3,Sb2O3,SnO2,CeO2,Nb2O5,V2O5和WO3,以及它们的混合物。 压电陶瓷组合物满足压电材料所需的压电特性如kp和Qm,在TCF中相变温度为320℃或更高,±30ppm /℃,振荡频率变化为0.1%以下 回流后 并且压电陶瓷组合物也具有良好的压电性能,使得泄漏电流降低。