| 摘要 |
A piezoelectric ceramic composition has the composition formula (Pb (a-b) Me b ) {(Ni (1-c)·d/3 Zn c·d/3 Nb 2/3 ) z Ti x Zr (1-x-z) }O 3 , 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. |
