Piezoelectric ceramic composition and piezoelectric device
AssigneeNgk Spark Plug Co., Ltd.
InventorsMasato YAMAZAKI, Kohei ITO, Yasuhiro FUJII, Katsuya YAMAGIWA, Takeshi MITSUOKA
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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.
Claims8
A piezoelectric ceramic composition comprising Na, Bi, Ti and Co wherein the composition ratio of said 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.
A piezoelectric ceramic composition comprising Na, Bi, Ti and Co and containing a compound having a grain structure of Na0.5Bi4.5Ti4O15 as a main component, wherein the content of said Co in terms of CoO is 0.70 mass % or less.
Dependencies are inferred from the claim text.