| 摘要 |
A piezoelectric ceramic composition has the composition formula (Pb<SUB>(a-b)</SUB>Me<SUB>b</SUB>){(Ni<SUB>(1-c).d/3</SUB>Zn<SUB>c.d/3</SUB>Nb<SUB>2/3</SUB>)<SUB>z</SUB>Ti<SUB>x</SUB>Zr<SUB>(1-x-z)</SUB>}O<SUB>3</SUB>, wherein Me represents at least one element selected from the group consisting of Ba, Sr and Ca; a, b, c, d, x and z satisfy the inequalities 0.975 <=a <=0.998, 0 <=b <=0.05, 1 <d <=1.40, and 0.39 <=x <=0.47; and c and z are located in a region surrounded by lines connecting Point A (z=0.25, c=0.1), Point B (z=0.25, c=0.85), Point C (z=0.1, c=0.6), Point D (z=0.075, 0.5), Point E (z=0.05, c=0.2), and Point F (z=0.05, c=0.1) or located on the lines in the z-c plane. Therefore, the piezoelectric ceramic composition can be fired at a low temperature and is effective in achieving a large piezoelectric constant, a high Curie point and a small dielectric constant. A piezoelectric actuator contains the piezoelectric ceramic composition.
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