Patent ID: 9022531
Filing Date: 2015-05-05
Classification: B41J,H01L

Abstract:
1. A piezoelectric element, comprising, on a substrate: a piezoelectric film; and a pair of electrodes provided in contact with the piezoelectric film; wherein the piezoelectric film comprises a perovskite-type metal oxide represented by the following general formula (1) as a main component: where A represents one of a Bi element, and one or more kinds of elements selected from trivalent metal elements and containing at least a Bi element; M represents at least one kind of element selected from Fe, Al, Sc, Mn, Y, Ga, and Yb; and 0.9≦x≦1.25, 0.4≦j≦0.6, 0.4≦k≦0.6, 0.09≦l≦0.49, 0.19≦m≦0.64, 0.13≦n≦0.55, and l+m+n=1 are satisfied, wherein the perovskite-type metal oxide is uniaxially (111)-oriented in pseudo-cubic notation in a thickness direction, wherein, of the pair of electrodes, a lower electrode provided on the substrate side comprises a multilayer electrode including at least a first electrode layer in contact with the substrate and a second electrode layer in contact with the piezoelectric film, and wherein the second electrode layer comprises a perovskite-type metal oxide electrode which is uniaxially (111)-oriented in pseudo-cubic notation in a thickness direction.