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Keywords:

  • ceramics;
  • ferroelectricity;
  • internal-bias field;
  • microstructure

Abstract

Piezoelectric 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.