Patent ID: 10734570

Abstract:
A piezoelectric element includes a first electrode, a second electrode, and a piezoelectric layer. The piezoelectric layer is provided between the first electrode and the second electrode, and is formed of a perovskite type oxide which contains potassium, sodium, niobium, and manganese. In the piezoelectric layer, a proportion of an A-site constituent element of the perovskite type oxide is smaller than a proportion of a B-site constituent element thereof. In XRD measurement of the piezoelectric layer, two or more peaks derived from the perovskite type oxide are provided in a range of 44°<2θ<48°, and an intensity ratio (X/Y) between a peak X having the highest intensity among the peaks, and a peak Y having the lowest intensity satisfies the following expression. 2.0<(X/Y)