| 摘要 |
PURPOSE:To obtain a piezoelectric ceramic composition having high electromechanical coupling coefficient and low dielectric constant and improved in heat resistance. CONSTITUTION:This composition is a multiple perovskite-type compound containing, as metallic components, at least Pb, Zr, Ti, Nb, Mn and W being expressed by composition formula in terms of molar ratio, pba[(NbbMncWd)eTifZr1--e-f]O3 ;where, (a), (b), (c), (d), (e) and (f) satisfy the following relationships: 0.95<= (a)<=1.05, 0.10<= (b)<=0.60, 0.30<= (c)<=0.60, 0.05<= (d)<=0.50, 0.04<= (e)<=0.12, 0.20<= (f)<=0.30, and (b)+(c)+(d)=1. |
