Pb(Zn_1/3Nb_2/3)O₃-PbTiO₃-PbZrO₃系セラミックスの圧電及び強誘電的性質

抄録

High density ceramics with compositions of 0.24Pb(Zn_1/3Nb_2/3)O₃⋅yPbTiO₃⋅(0.76-y) PbZrO₃ (PZNTZ 24/100y/76-100y), where y=0.350 to 0.456 were fabricated by normal sintering. The dielectric, piezoelectric and ferroelectric properties of these PZNTZ ceramics were systematically investigated. The morphotropic phase boundary (MPB) composition of PZNTZ 24/100y/76-100y system was at y=0.376. The highest values of electromechanical coupling factor, k_p and piezoelectric constant, d₃₁ were 63% and -191pC/N, respectively, and were obtained in the PZNTZ 24/37.6/38.4 ceramics. Regarding the ferroelectric properties, the largest remanent polarization, P_r=38.1μC/cm² and the smallest coercive field, E_c=11.6kV/cm among the PZNTZ ceramics studied in this work were obtained in the PZNTZ 24/35.3/40.7 ceramics. The experimental results demonstrate the PZNTZ 24/37.6/38.4 ceramics are potential element materials for piezoelectric applications.