| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric ceramic composition having a large piezoelectric displacement particularly under high electric field, a small temperature change of a specific dielectric constant and an excellent insulation property. SOLUTION: The piezoelectric ceramic composition is expressed by a composition formula, aPbTiO3+bPbZrO3+cPb(Ni1/3.Nb2/3)O3 (a+b+c=100), exists on a line formed by connecting composition points of point I (a=35 mol%, b=30 mol%, c=35 mol%), point J (a=44 mol%, b=16 mol%, c=40 mol%), point K (a=50 mol%, b=40 mol%, c=10 mol%) and point L (a=40 mol%, b=50 mol%, c=10 mol%) in fig. 1 and in the region surrounded by the 4 points and has >=500 pm/V piezoelectric displacement when 500 kV/m DC electric field is applied in the same direction as the polarization axis and <=300% temperature change of the specific dielectric constant in the temperature range of (-40)-170 deg.C. |
