This invention provides a piezoelectric ceramic composition that does not
contain lead, can be sintered at a normal pressure and is excellent in at
least one of a piezoelectric constant, an electro-mechanical coupling
coefficient, a dielectric loss, a relative dielectric constant and a
Curie point, its production method, and a piezoelectric device and a
dielectric device each utilizing the piezoelectric ceramic composition.
The invention relates to a piezoelectric composition expressed by the
general formula
{Li.sub.x(K.sub.1-yNa.sub.y).sub.1-x}(Nb.sub.1-zSb.sub.z)O.sub.3, each of
x, y and z respectively falling within composition ranges of
0.ltoreq.x.ltoreq.0.2, 0.ltoreq.y.ltoreq.1.0 and 0.ltoreq.z.ltoreq.0.2
(with the exception of x=z=0), and its production method. The invention
further relates to a piezoelectric device having a piezoelectric body
formed of the piezoelectric ceramic composition described above and a
dielectric device having a dielectric body formed of the piezoelectric
ceramic composition described above.