abstract |
Disclosed is a piezoelectric ceramic composition mainly composed of a bismuth lamellar compound containing Na, Bi, Co and an Ln (lanthanoid). Also disclosed is a piezoelectric ceramic composition mainly composed of a compound containing Na, Bi, Ti, Co and an Ln (lanthanoid) and having a crystal phase represented by Na0.5Bi4.5Ti4O15. The piezoelectric ceramic compositions are characterized in that the atomic ratio satisfies the following relation: 0 < Ln/(Na + Bi + Ln) ≤ 0.04. |