Effects of CuO and ZnO Additives on Sintering Temperature and Piezoelectric Properties of 0.41Pb(Ni_(1/3)Nb_(2/3))O_3-0.36PbTiO_3-0.23PbZrO_3 Ceramics

摘要

ZnO-added 0.41PNN-0.36PT-0.23PZ ceramics cannot be sintered below 950℃. However, when CuO is added, the liquid phase forms and specimens can be sintered even at 850℃. The dielectric constant ((ε~T)_3/ε_0), piezoelectric constant (d_(33)) and electromechanical coupling factor (k_p) increase with the addition of CuO and this is due to the enhancement of the density of the specimens. When CuO is added to 0.41PNN-0.36PT-0.23PZ ceramics, improvements of density, (ε~T)_3/ε_0, d_(33) and k_p are also observed. However, the d_(33) and k_p values of the CuO-added 0.41PNN-0.36PT-0.23PZ ceramics are less than those of the CuO- and ZnO-added specimens. Therefore, ZnO is effective in improving the piezoelectric properties of 0.41PNN-0.36PT-0.23PZ ceramics. Good dielectric and piezoelectric properties of d_(33)=575(pC/N), k_P=0.55 and (ε~T)_3/ε_0= 3900 are obtained for 0.41PNN-0.36PT-0.23PZ+3.0 mol% ZnO with 1 mol% CuO sintered at 900℃ for 2h.