Patent ID: 8183747

Claim:
A piezoelectric porcelain composition comprising 100{(1−x)(K 1−a−b Na a Li b )(Nb 1−c Ta c )O 3 −xM2M4O 3 }+αMn+βM4 wherein the main ingredient is represented by the general formula ((1−x)(K 1−a−b Na a Li b )(Nb 1−c Ta c )O 3 −xM2M4O 3 ) in which M2 is at least one member selected from the group consisting of Ca, Ba and Sr, M4 is at least one member selected from the group consisting of Zr, Sn and Hf, 0.005≦x≦0.1, 0≦a≦0.9, 0≦b≦0.1, 0≦a+b≦0.9, and 0≦c≦0.3, the amount α of Mn ranges from 2 to 15 mols, relative to 100 mol of the main ingredient, and the amount β of M4 ranges from 0.1 to 5.0 mols, relative to 100 mol of the main ingredient, said piezoelectric porcelain composition has the property of being co-sinterable with Ni electrodes in a reducing atmosphere.