发明公开
EP2295389A1 PIEZOELECTRIC CERAMIC COMPOSITION AND PIEZOELECTRIC ELEMENT MADE BY USING THE SAME
有权
PIEZOELEKTRISCHE KERAMIKZUSAMMENSETZUNG UND PIEZOELEKTRISCHES ELEMENT DARAUS
- 专利标题: PIEZOELECTRIC CERAMIC COMPOSITION AND PIEZOELECTRIC ELEMENT MADE BY USING THE SAME
- 专利标题(中): PIEZOELEKTRISCHE KERAMIKZUSAMMENSETZUNG UND PIEZOELEKTRISCHES ELEMENT DARAUS
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申请号: EP09773120.2申请日: 2009-06-22
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公开(公告)号: EP2295389A1公开(公告)日: 2011-03-16
- 发明人: YAMAZAKI, Masato , MATSUOKA, Takayuki , YAMAGIWA, Katsuya , MITSUOKA, Takeshi
- 申请人: NGK Spark Plug Co., Ltd.
- 申请人地址: 14-18, Takatsuji-cho Mizuho-ku Nagoya-shi Aichi 467-8525 JP
- 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: 14-18, Takatsuji-cho Mizuho-ku Nagoya-shi Aichi 467-8525 JP
- 代理机构: Nicholls, Michael John
- 优先权: JP2008171618 20080630
- 国际公布: WO2010001542 20100107
- 主分类号: C04B35/46
- IPC分类号: C04B35/46 ; H01L41/08 ; H01L41/09 ; H01L41/107 ; H01L41/187 ; H01L41/22 ; H01L41/24 ; H03H9/17
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: a Na 2 O- b Bi 2 O 3 - c TiO 2 - d CrO 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 Na 0.5 Bi 4.5 Ti 4 O 15 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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