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.

 
Web www.patentalert.com

> Method and device for treating automotive exhaust

~ 00376