| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric ceramic and piezoelectric element which is characterized in that it is high in electro-mechanical coupling coefficient especially when used in a thickness sliding mode, and little in temperature dependency of resonance frequency. SOLUTION: The piezoelectric ceramic is comprised of perovskite typy crystal grain, the main ingredient of which is NaNbO3 , A part of Na occupying A site is substituted by at least one kind of among (Bi1/2 K1/2 ), (Bi1/2 Na1/2 ), (Bi1/2 Li1/2 ), and Mn, and a part of Nb occupying B site is substituted at least by Si. |
