| 摘要 |
A piezoelectric device is formed by simultaneously firing a piezoelectric ceramic mainly composed of a perovskite complex oxide represented by general formula ABO 3 and electrodes mainly composed of copper. The piezoelectric ceramic is represented by Pb ±-a Me a [(M II 1/3 M V (2+b)/3)z Ti x Zr 1-x-z ]O 3 (wherein Me represents a metal element, M II is an acceptor element which is a divalent metal element, and M V is a donor element which is a pentavalent metal element), and satisfies equations 0.05 ‰ z ‰ 0.40, 0 < bz/3 ‰ 0.035, 0.345 ‰ x ‰ 0.480, 0.965 ‰ ± ‰ 1.020, and 0 ‰ a ‰ 0.05. In other words, the B sites contain excessive donors, and thus a piezoelectric device having good piezoelectric characteristics can be obtained even in the cases where a base metal material mainly composed of inexpensive copper is used as the internal electrode material. |
