Piezoelectric device with piezoelectric ceramic layer constituted by alkali-containing niobate type perovskite composition
AssigneeTaiyo Yuden Co., Ltd.
InventorsShinichiro Ikemi, Yutaka Doshida
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Abstract
A piezoelectric device has a piezoelectric ceramic layer obtained by sintering a piezoelectric ceramic composition that contains an alkali-containing niobate type perovskite composition which is represented by (LilNamK1-l-m)n(Nb1-oTao)O3 (wherein 0.04≦l≦0.1, 0≦m≦1, 0.95≦n≦1.05, 0≦o≦1) and Ag component, as well as a conductor layer sandwiching the piezoelectric ceramic layer. The piezoelectric ceramic layer has Ag segregated in voids present in a sintered compact of the perovskite composition in terms of oxides relative to the perovskite composition.
Claims6
A piezoelectric device having a piezoelectric ceramic layer obtained by sintering a piezoelectric ceramic composition that contains a perovskite composition and Ag component, as well as a conductor layer sandwiching the piezoelectric ceramic layer, wherein the piezoelectric ceramic layer has Ag segregated in voids present in a sintered compact of the perovskite composition, wherein the perovskite composition is an alkali-containing niobate type perovskite composition expressed by Formula (2) below, and the piezoelectric ceramic layer has a Si and K-containing crystalline or non-crystalline substance present at grain boundaries or grain boundary triple points of crystal grains constituted by a sintered compact of the perovskite composition:
- (LilNamK1-l-m)n(Nb1-oTao)O3 (2)
- wherein l, m, n, and o meet the respective requirements below:
- 0.04<l≦0.1
- 0≦m≦1
- 0.95≦n≦1.05
- 0≦o≦1.
Dependencies are inferred from the claim text.