Study on dielectric and ferroelectric anisotropy for hot-forged PZN-PLZT ceramics

Dielectric and ferroelectric properties of Pb 0.88 La 0.12 (Zn 1/3 Nb 2/3 ) 0.3 (Zr 0.4 Ti 0.6 ) 0.67 O 3 ceramics prepared by hot forging method and conventional sintering have been studied. For temperature dependence, the maximum value of dielectric loss measured in the direction perpendicular to the pressing axis was 7 times higher than that measured in the parellel direction and a more broadened dielectric permittivity peak was also observed in the perpendicular direction. Taking into account the fact that no obvious grain orientation was evidenced from the XRD patterns of the compared samples, this anisotropy in dielectric property was attributed to difference in the distribution of stresses and defects in the parallel and perpendicular direction.