Patent ID: 8004162

Claim:
A piezoelectric device comprising: a substrate; a first electrode film formed on the substrate; a piezoelectric film represented by Pb 1+X (Zr Y Ti 1−Y )O 3+X (0≦X≦0.3, 0≦Y≦0.55) whose peak intensity of a pyrochlore phase measured by an X-ray diffraction method is 10% or less with respect to a sum of peak intensities of a (100) plane orientation, a (001) plane orientation, a (110) plane orientation, a (101) plane orientation, and a (111) plane orientation of a perovskite phase, the piezoelectric film being formed on the first electrode film with a film thickness of 400 nm or more and 1,000 nm or less; and a second electrode film laminated on the piezoelectric film.