Invention Grant
- Patent Title: Unleaded piezoelectric ceramic composition, piezoelectric element using same, device, and method for manufacturing unleaded piezoelectric ceramic composition
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Application No.: US14780235Application Date: 2014-03-11
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Publication No.: US09938197B2Publication Date: 2018-04-10
- Inventor: Masato Yamazaki , Takayuki Matsuoka , Kazuaki Kitamura , Hisashi Kozuka , Hideto Yamada , Toshiaki Kurahashi , Yasuyuki Okimura , Kazushige Ohbayashi , Takashi Kasashima
- 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: JP2013-071778 20130329
- International Application: PCT/JP2014/001358 WO 20140311
- International Announcement: WO2014/156015 WO 20141002
- Main IPC: H01L41/187
- IPC: H01L41/187 ; C04B35/00 ; C04B35/495 ; G01L23/22 ; H01L41/43 ; H01L41/113 ; H01L41/047 ; H01L41/08 ; H01L41/09 ; H03H9/02
Abstract:
A lead-free piezoelectric ceramic composition includes a first crystal phase made of an alkali niobate/tantalate type perovskite oxide having piezoelectric properties, and a second crystal phase made of an M-Ti—O spinel compound (where the element M is a monovalent to quadrivalent element).
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