Effect of sintering temperature on internal‐bias field and electric properties of 0.2PZN–0.8PZT ceramics

Abstract

AbstractPiezoelectric ceramics system of Pb((Zn1/3Nb2/3)0.20–(Zr0.50Ti0.50)0.80)O3 (0.2PZN–0.8PZT) was prepared by the conventional oxide mixing method. The dependences of the internal‐bias field and electric properties on the sintering temperature were investigated systematically. The results indicated that the perovskite structure was stable in a wide sintering temperature region. The rise of sintering temperature favored the enlargement of the grain size, while showing a slight effect on tetragonal distortion c/a. The dissymmetrical shape of polarization–electric field hysteresis loops was displayed in all specimens, indicating the existence of internal‐bias field (Ei). With the increase of sintering temperature, Ei sharply decreased to 0.84 kV cm−1 at 1000 °C then increased, while the remnant polarization (Pr) was found to show the inverse trend. The derivative effects of the sintering temperatures, involving the internal‐bias field effect and grain‐size effect, affected the ferroelectric and piezoelectric properties of 0.2PZN–0.8PZT.