Patent ID: 8076828

Claim:
A piezoelectric ceramic composition comprising a main constituent represented by the compositional formula {(1−x)(K 1-a-b Na a Li b )(Nb 1-c-d Ta c Sb d )O 3 }−xM2M4O 3 } wherein M2 is at least one member of the group consisting of Ca, Ba, and Sr, M4 is at least one member of the group consisting of Zr, Sn, and Hf, 0≦x≦0.06, 0≦a≦0.9, 0≦b≦0.1, 0≦c≦0.3, and 0≦d≦0.05, and as accessory constituents, 2α mol of Na, (α+β) mol of M4′, γ mol of Mn and δ mol of M3, with respect to 100 mol of the main constituent, wherein M4′ is at least one member of the group consisting of Zr, Sn, and Hf, M3 is at least one member selected from the group of Sc, In, Yb, Y, Nd, Eu, Gd, Dy, Sm, Ho, Er, Tb, Lu, La, and Pr, 0.1≦α≦β, 1≦α+β≦10, 0≦γ≦10, and 0≦δ≦5.