Patent ID: 8721051

Claim:
A piezoelectric element comprising: a piezoelectric layer and an electrode for applying a voltage to the piezoelectric layer, wherein: the piezoelectric layer includes a solid solution of bismuth lanthanum titanate zincate and lead titanate, the molar ratio of the bismuth lanthanum titanate zincate to the lead titanate in the piezoelectric layer is 0.39 or more and 0.61 or less, the piezoelectric layer satisfies the following equation: (1−u)Pb (1+v) TiO 3 −u(Bi (1−w) La w )(Zn (1−x) Ti x )O 3 , and v is greater than 0 and less than or equal to 0.1, wherein the piezoelectric layer has a thickness of 100 nm or more and 3 μm or less.