Invention Grant
- 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.: US10340441B2Publication Date: 2019-07-02
- 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 Aichi
- Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee Address: JP Aichi
- Agency: Sughrue Mion, PLLC
- Priority: JP2014-081771 20140411; JP2014-248976 20141209
- International Application: PCT/JP2015/001191 WO 20150305
- International Announcement: WO2015/155931 WO 20151015
- Main IPC: H01L41/047
- IPC: H01L41/047 ; H01L41/187 ; H01L41/43 ; C04B35/495 ; C04B35/64
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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