Patent ID: 7608215

Claim:
A manufacturing method for a piezoelectric ceramic composition comprising steps of: polarizing a ceramic composition comprising a perovskite compound containing Pb, Zr, Ti, Mn and Nb; and heat-treating said polarized ceramic composition within a temperature range higher than 0.80 Tc and lower than Tc (Tc denoting the Curie temperature of said ceramic composition) for 1 to 40 minutes, wherein the Curie temperature Tc of said ceramic composition is 340° C. or higher; wherein said ceramic composition is represented by a formula, Pb α [(Mn 1/3 Nb 2/3 ) x Ti y Zr z ]O 3 , in which α, x , y and z fall within the ranges of 0.95≦α≦1.02, 0.02≦x≦0.15, 0.48≦y≦0.62, and 0.30≦z≦0.42, respectively; and wherein said ceramic composition comprises as an additive Mn in 0.65 wt % or less (not inclusive of 0) in terms of MnCO 3 and/or Cr in 0.65 wt % or less (not inclusive of 0) in terms of Cr 2 O 3 .