Patent ID: 6803702
Filing Date: 2004-10-12
Classification: B41J,H01L

Abstract:
A method for manufacturing a piezoelectric element having a piezoelectric material with a perovskite crystal structure expressed by the formula ABO3 in which the symbol A represents at least an element â€œaâ€ , comprising the steps of:a) forming a lower electrode; b) forming over the lower electrode a film of the piezoelectric material having a perovskite crystal structure expressed by the formula ABO3 in which the symbol A represents at least an element â€œaâ€  by, a first step of producing an oxide in an amorphous state containing an element â€œaâ€²â€  and subjecting the oxide to a hydrothermal process using an aqueous solution containing the element â€œaâ€²â€  thereby crystallizing the oxide, wherein the oxide produced in the first step is a piezoelectric material having a perovskite crystal structure expressed by the formula ABO3 in which the symbol A represents at least an element â€œaâ€²â€ ; and a second step of producing a piezoelectric material by subjecting the oxide produced in the first step to a hydrothermal process using an aqueous solution containing the element â€œaâ€ , so as to increase the amount of the element â€œaâ€  contained in the piezoelectric material due to its substitution for element â€œaâ€²â€  contained in the oxide produced in the first step; and c) forming an upper electrode over the piezoelectric material formed in step b.