Provided is a piezoelectric ceramic capable of improving its piezoelectric
properties. The piezoelectric ceramic comprises a rhombohedral perovskite
structure compound such as (Na.sub.0.5 Bi.sub.0.5)TiO.sub.3, a tetragonal
perovskite structure compound such as BaTiO.sub.3 and (K.sub.0.5
Bi.sub.0.5)TiO.sub.3 and an orthorhombic perovskite structure compound
such as NaNbO.sub.3, KNbO.sub.3 and CaTiO.sub.3, or the rhombohedral
perovskite structure compound, the tetragonal perovskite structure
compound and a cubic perovskite structure compound such as SrTiO3. Three
kinds of perovskite structure compounds having different crystal
structures are comprised, so that the piezoelectric properties can be
improved. The three kinds of compounds may perfectly form a solid solution
or not.
