发明申请
- 专利标题： PIEZOELECTRIC CERAMIC COMPOSITION AND PIEZOELECTRIC ELEMENT MADE BY USING THE SAME
- 专利标题（中）： 压电陶瓷组合物和使用它的压电元件
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申请号： US12747810申请日： 2009-06-22
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公开(公告)号： US20100264355A1公开(公告)日： 2010-10-21
- 发明人: Masato Yamazaki , Takayuki Matsuoka , Katsuya Yamagiwa , Takeshi Mitsuoka
- 申请人： Masato Yamazaki , Takayuki Matsuoka , Katsuya Yamagiwa , Takeshi Mitsuoka
- 申请人地址： JP Nagoya-shi, Aichi
- 专利权人： NGK SPARK PLUG CO., LTD.
- 当前专利权人： NGK SPARK PLUG CO., LTD.
- 当前专利权人地址： JP Nagoya-shi, Aichi
- 优先权： JP2008-171618 20080630
- 国际申请： PCT/JP2009/002817 WO 20090622
- 主分类号： H01L41/187
- IPC分类号： H01L41/187
摘要：
The present invention provides a piezoelectric ceramic composition having a high thermal resistance and a high piezoelectric distortion constant and a piezoelectric element using the piezoelectric ceramic composition. The piezoelectric ceramic composition of the present invention contains Na, Bi, Ti, Cr and O, wherein the content ratio of Na, Bi, Ti and Cr in terms of oxides thereof falls within the following composition range: aNa2O-bBi2O3-cTiO2-dCrO where a, b, c and d are mole fractions; 0.030≦a≦0.042; 0.330≦b≦0.370; 0.580≦c≦0.620; 0≦d≦0.017; and a+b+c+d=1. The piezoelectric ceramic composition preferably has a main crystal phase of bismuth layer-structured ferroelectric, more preferably Na0.5Bi4.5Ti4O15 crystal. The piezoelectric element of the present invention includes a piezoelectric body formed of the piezoelectric ceramic composition and at least a pair of electrodes held in contact with the piezoelectric body.
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