Invention Application
- Patent Title: LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION, PIEZOELECTRIC ELEMENT USING THE SAME, AND METHOD OF MANUFACTURING LEAD-FREE PIEZOELECTRIC CERAMIC COMPOSITION
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Application No.: US15129877Application Date: 2015-03-05
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Publication No.: US20170141292A1Publication Date: 2017-05-18
- Inventor: Hisashi KOZUKA , Hideto YAMADA , Takayuki MATSUOKA , Kazuaki KITAMURA , Masato YAMAZAKI , Toshiaki KURAHASHI , Takashi KASASHIMA , Yasuyuki OKIMURA , Kazushige OHBAYASHI
- Applicant: NGK SPARK PLUG CO., LTD.
- Applicant Address: JP Nagoya-shi, Aichi
- Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee Address: JP Nagoya-shi, Aichi
- Priority: JP2014-081771 20140411; JP2014-248976 20141209
- International Application: PCT/JP2015/001191 WO 20150305
- Main IPC: H01L41/187
- IPC: H01L41/187 ; C04B35/64 ; C04B35/495 ; H01L41/047 ; H01L41/43
Abstract:
A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide subphase. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase assumes a value in a range represented by 0.40 direction with the main phase represented as a pseudo-cubic crystal system.
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