| 摘要: | To develop the anisotropic ceramic substrate with low sintering temperature for sensor applications, the iow cost and feasible material with moderate piezoelectrties, good dielecties and higher curie temperature would be explored. The piezoelectrtic ceramics with compositions of PbCa0.01[(Mn1/3Nb2/3)0.06-(Zr0.52Ti0.48)0.94]O3(PMN-PZT)+0.1 wt.％ CuO + x wt.％ ZnO (0.5≦x≦2) (abbreviated PMNZT-CZ10x) had been prepared by the conventional mixed-oxides method. ZnO dioants were used as the sintering aid to improve the bulk density under low sintering temperature (i.e.930-1020℃). The phase structure, microstructure, dielectric and piezoelectric properties, and ferroelectric properties with the amount of ZnO additive were systematically investigated. Experimental results showed that the sintering temperature could be lowered down to 980℃ and still keep reasonably good piezoelectric activity (i.e. high electromechanical coupling factor kp, kt), dielectric and ferroelectric properties. The preferable composition, obtained at x=1, presented the values of the electromechanical coupling factor (kp) (kt), mechanical quality factor (Qm), piezoelectric charge constant (d33), relative dielectric constant, loss tangent, coercive field (Ec), remanent polarization (Pr), temperature coefficient of resonant frequency (TCF) and curie point (Tc) of 0.55, 0.48, 475, 235 pc/N, 1620, 0.0023, 1.1kV/mm, 29 coul/cm2, -190ppm/℃, and 346℃. We found that the addition of ZnO could anhance the relative dielectric constant and remanent polarization compared to those of pure PMN-PZT. |
