| 摘要 |
PROBLEM TO BE SOLVED: To obtain a piezoelectric ceramic composition consisting mainly of potassium sodium lithium niobate, having a dielectric constant of <=180 and the resonance frequency coefficient of thickness vibration of >=3,000 Hz.m so as to be suitable for using in high frequency region, and also having such favorable property as to be <=100 ppm in the temperature coefficient of resonance frequency. SOLUTION: This piezoelectric ceramic composition consists mainly of a composition of the formula: (1-n) (K1-x-y Nax Liy )m (Nb1-z Taz )O3 -nM1M2O3 (wherein, M1 is a bivalent metal atom such as Mg, Ca, Sr, Ba or Pb; M2 is a tetravalent metal atom such as Ti, Zr, Sn or Hf; (x)<=0.9; 0.02<=(y)<=0.03; 0.75<=(x+y); 0<=(z)<=0.3; 0.98<=(m)<=1.0; 0<(n)<=0.05). |
