Patent ID: 7166954

Claim:
A piezoelectric film represented by the following general formula: Pb 1−b [((X 1/3 Nb 2/3 ) 1−c B′ c ) 1−a Y a ]O 3 wherein: X is at least one of Mg, Zn and Ni; B′ is at least one of Zr, Ti and Hf; Y is at least one of V, Nb, Ta, Cr, Mo and W; a satisfies 0.05≦a<0.30; b satisfies 0.025≦b≦0.15; when X is Mg, c satisfies 0.25≦c≦0.35; when X is Ni, c satisfies 0.30≦c≦0.40; and when X is Zn, c satisfies 0.05≦c≦0.15.