Patent ID: 6551652
Filing Date: 2003-04-22
Classification: C23C,H01L,Y10T

Abstract:
A process for producing a piezoelectric element comprising a piezoelectric film, an upper electrode and a lower electrode with the piezoelectric film held therebetween, said process comprising:a) applying, at least once, a first sol for use in forming the piezoelectric film on a substrate having the lower electrode formed thereon to form a lower film; b) drying the lower film by subjecting to heat treatment at a first temperature; c) pyrolyzing the lower film by subjecting to heat treatment at a second temperature which is higher than the first temperature; d) applying a second sol having a greater lead content than the first sol to form an upper film; e) drying the upper film by subjecting to heat treatment at the first temperature; f) pyrolyzing the upper film by subjecting to heat treatment at the second temperature; g) crystallizing the lower and upper films by subjecting to heat treatment at a third temperature which is higher than the second temperature after step f); h) performing a cycle comprising steps a) to f); and i) crystallizing the films by subjecting to heat treatment at a fourth temperature which is higher than the third temperature, after step h); wherein a cycle comprising steps a) to g) is performed at least once.