发明申请
- 专利标题: LAMINATED PIEZOELECTRIC ELEMENT AND PROCESS FOR PRODUCING THE SAME
- 专利标题(中): 层压压电元件及其制造方法
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申请号: US12131371申请日: 2008-06-02
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公开(公告)号: US20080231147A1公开(公告)日: 2008-09-25
- 发明人: Atsushi Yamamoto , Yoichi Deguchi , Koichi Hayashi
- 申请人: Atsushi Yamamoto , Yoichi Deguchi , Koichi Hayashi
- 专利权人: Murata Manufacturing Co., Ltd.
- 当前专利权人: Murata Manufacturing Co., Ltd.
- 优先权: JPJP-2005-354332 20051208
- 主分类号: H01L41/047
- IPC分类号: H01L41/047 ; H01L41/22
摘要:
A multilayer piezoelectric device including a body having internal electrode layers and piezoelectric ceramic layers alternately stacked. The internal electrode layers contain Cu as a major component, the piezoelectric ceramic layers contain a compound oxide represented by Pb(Ti, Zr)O3 as a major component, and a metal oxide (Nb2O5, Sb2O5, Ta2O5, or WO3) containing Nb, Sb, Ta, or W, which is at least one of a pentavalent metal element and a hexavalent metal element, is incorporated in the piezoelectric ceramic layers such that the concentration of the metal oxide decreases with distance from the internal electrode layers. Thereby, even in a case where internal electrodes contain Cu as a major component, it is possible to provide a multilayer piezoelectric device which can be obtained by low-temperature firing while ensuring a sufficient piezoelectric constant.
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