Invention Publication
- Patent Title: LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION, PIEZOELECTRIC ELEMENT USING SAME, PRODUCTION METHOD FOR LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION
- Patent Title (中): 无铅压电陶瓷组合物，压电元件的是，法无铅压电陶瓷组合物
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Application No.: EP15776038.0Application Date: 2015-03-05
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Publication No.: EP3130573A1Publication Date: 2017-02-15
- Inventor: KOZUKA, Hisashi , YAMADA, Hideto , MATSUOKA, Takayuki , KITAMURA, Kazuaki , YAMAZAKI, Masato , KURAHASHI, Toshiaki , KASASHIMA, Takashi , OKIMURA, Yasuyuki , OHBAYASHI, Kazushige
- Applicant: NGK Sparkplug Co., Ltd.
- Applicant Address: 14-18 Takatsuji-cho Mizuho-ku Nagoya-shi, Aichi 467-8525 JP
- Assignee: NGK Sparkplug Co., Ltd.
- Current Assignee: NGK Sparkplug Co., Ltd.
- Current Assignee Address: 14-18 Takatsuji-cho Mizuho-ku Nagoya-shi, Aichi 467-8525 JP
- Agency: Grünecker Patent- und Rechtsanwälte PartG mbB
- Priority: JP2014081771 20140411; JP2014248978 20141209
- International Announcement: WO2015155933 20151015
- Main IPC: C04B35/00
- IPC: C04B35/00 ; H01L41/187 ; H01L41/39 ; H01L41/43
Abstract:
Provided is a lead-free piezoelectric ceramic composition having high piezoelectric properties. The lead-free piezoelectric ceramic composition fulfils a molar ratio (Na/K) for Na (sodium) and K (potassium) in the main phase thereof of 0.40 direction when the main phase is expressed as a pseudo cubic crystal. The area ratio of the crystal phase reflecting the second spot group in the main phase is no more than 33% and the maximum particle diameter of the crystals reflecting the second spot group in the main phase is no more than 25 nm.
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