Patent ID: 7622852

Claim:
A piezoelectric member of an epitaxial oxide of <100> orientation having at least a tetragonal crystal structure, constituted of a perovskite type composite oxide represented by a general formula ABO 3 , which comprises at least domains C, D and E of [100] orientation having a deviation in crystal direction one another, wherein an angular deviation between a [100] direction of the domain C and a [100] direction of the domain D is 5° or less, an angular deviation between a [100] direction of the domain D and a [100] direction of the domain E is 5° or less, an angular deviation between a [100] direction of the domain C and a [100] direction of the domain E is 0.3° or less, an angular deviation between a [100] direction of the domain D and a [100] direction of the domain E is 0.3° or more, an angular deviation between a [001] direction of the domain C and a [001] direction of the domain E is 1.0° or more, and an angular deviation between a [001] direction of the domain D and a [001] direction of the domain E is 1.0° or more.