Piezoelectric ceramic composition and piezoelectric element

摘要

A piezoelectric ceramic composition is expressed by the formula Pbalpha[{Niw/3Nb1-(w/3)}xTiyZrz]O3. The B site variables x, y, and z lie in a predetermined region in a ternary diagram. The Ni-Nb molar proportion variable satisfies the relationship 0.85<=w<1.00. The Pb molar content alpha is reduced from the stoichiometric ratio to a value satisfying the relationship 0.950<=alpha<=0.995. At least one element selected from the group consisting of Sr, Ca, and Ba may be substituted for about 10 mol percent of the Pb.