Piezoelectric ceramic composition and piezoelectric device

US7808161B2 · kind B2 · utility

Assignee

• NGK SPARK PLUG CO., LTD. · US

Inventors

• Masato Yamazaki · Sagamihara, JP
• Kohei Ito · Komaki, JP
• Yasuhiro Fujii · Tokyo, JP
• Katsuya Yamagiwa · Komaki, JP
• Takeshi Mitsuoka · Konan, JP

Key dates

• Filing date: Mar 25, 2008
• Grant date: Oct 5, 2010
• Expiry date: Oct 9, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/72
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

There is provided a piezoelectric ceramic composition that contains Na, Bi, Ti and Co wherein the composition ratio of Na, Bi, Ti and Co in terms of oxides thereof is in the following composition range (1):aNa2O-bBi2O3-cTiO2-dCoO  (1)where a, b, c and d are mole fractions; 0.03≦a≦0.042; 0.330≦b≦0.370; 0.580≦c≦0.620; 0<d≦0.017; and a+b+c+d=1.