Patent ID: 8643255

Claim:
A piezoelectric ceramic comprising: a bismuth layered compound represented by a composition formula: Bi 4 Ti 3 O 12 .α[(1−β)(M1 1-γ Ln γ )TiO 3 +βM2M3O 3 ], α, β, and γ satisfy 0.3≦α≦0.95, 0≦β≦0.5, and 0≦γ≦0.5; M1 is at least one selected from Sr, Ba, Ca, (Bi 0.5 Na 0.5 ), (Bi 0.5 K 0.5 ), and (Bi 0.5 Li 0.5 ); M2 is at least one selected from Bi, Na, K, and Li; M3 is at least one selected from Fe and Nb; and Ln represents a lanthanoid; and Co in an amount of 0.01 to 0.7 parts by mass in terms of CoO, with respect to 100 parts by mass of the bismuth layered compound.