Ferroelectric Properties of Pb(Zr_(1/2)Ti_(1/2)O_3-Pb(Zn_(1/3)Nb_(2/3)O_3 Ceramics Under Compressive Stress Applied Perpendicular to Electric Field

摘要

Effects of perpendicular compressive stress on the ferroelectric properties of ceramics in PZT-PZN system were investigated. The (l-x) Pb(Zr_(1/2)Ti_(1/2)O_3-Pb(Zn_(1/3)Nb_(2/3)O_3 or (l-x)PZT- (x)PZN (x= 0.1-0.5) ceramics were prepared by a conventional mixed-oxide method. The ferroelectric properties were measured under compressive stress applied perpendicular to an electric field direction at stress levels up to 90 MPa using a compressometer in conjunction with a modified Sawyer-Tower circuit. It was found that with increasing compressive stress the area of the ferroelectric hysteresis (P-E) loops, the maximum polarization (P_max)> and the remanent polarization (P_r) decreased, while the coercive field (E_c) remained relatively constant. These results were interpreted through the domain switching, clamping of domain walls and de-poling mechanisms.