Patent ID: 8310135

Claim:
A piezoelectric thin film element, comprising on a substrate: a piezoelectric thin film expressed by a general formula (Na x K y Li z )NbO 3 wherein 0<x<1, 0<y<1, 0<z<0.2, and wherein x+y+z=1; and an upper electrode laminated thereon, wherein the piezoelectric thin film has a crystal structure of any one of a pseudo-cubic crystal, a tetragonal crystal, or an orthorhombic crystal, or has a crystal structure of coexistence of at least two of the pseudo-cubic crystal, the tetragonal crystal, or the orthorhombic crystal, and in such crystal structures, there is a coexistence of (001) oriented crystal grains oriented in (001) direction, and (111) oriented crystal grains oriented in (111) direction , with an angle formed by at least one of the crystal axes of the crystal grains and a normal line of the substrate surface set to be in a range of 0° to 10°.