Patent ID: 6652905
Filing Date: 2003-11-25
Classification: A61P,C04B,H01L,Y10T

Abstract:
A process for producing a piezoelectric element, which comprises:coating, on a ceramic substrate or on an electrode(s) formed on a ceramic substrate, a piezoelectric material made of a ceramic composition composed mainly of a PbMg1/3Nb2/3O3â€”PbZrO3â€”PbTiO3 ternary system solid solution composition represented by the following general formula (1) and containing 0.05 to 10.0% by weight, based on the ceramic composition, of NiO, and heat-treating the coated piezoelectric material in the co-presence of an atmosphere-controlling material having a formulation of the same NiO content as the ceramic composition or a formulation of higher Ni content than the ceramic composition, Pbx(Mgy/3Nb2/3)aTibZrcO3â€ƒâ€ƒ(1) wherein 0.95&lE;x&lE;1.05; 0.8&lE;y&lE;1.0; a, b and c are decimals falling in a range surrounded by (a,b,c)=(0.550, 0.425, 0.025), (0.550, 0.325, 0.125), (0.375, 0.325, 0.300), (0.100, 0.425, 0.475), (0.100, 0.475, 0.425) and (0.375, 0.425, 0.200), and a+b+c=1.000.