Patent ID: 7901800
Filing Date: 2011-03-08
Classification: H01L,Y10T

Abstract:
1. A piezoelectric element comprising: a Si substrate; a piezoelectric film formed above the Si substrate and comprising a potassium sodium niobate expressed by a general formula (K,Na)NbO an intermediate layer formed between the Si substrate and the piezoelectric film for generating a stress in a compressive direction in the piezoelectric film, wherein the piezoelectric film further comprises piezoelectric material having an average grain size within a range 0.1 μm to 1.0 μm, wherein the intermediate layer further comprises additives of 10% or less of other elements and has the perovskite structure, and wherein the additives in the intermediate layer are in a range of greater than 0% and 10% or less of the other element; and wherein the intermediate layer comprises at least one compound selected from the group consisting of LaAlO