PREPARATION AND FERROELECTRIC PROPERTY OF PMnS-PZN-PZT PIEZOELECTRIC FIBER

0.8Pb(Mn1/3Sb2/3)0.05(Zr1/2Ti1/2)0.95O3-0.2Pb(Zn1/3Nb2/3)0.28(Zr1/2Ti1/2)0.72O3 (PMnS-PZN-PZT) ceramic powder was prepared by solid-phase method,and then PMnS-PZN-PZT piezoelectric fiber was prepared by viscous polymer processing (VPP). The influence of the restrained state of fiber on its ferroelectrictic properties was investigated. The results show that the piezoelectric fiber prepared by the VPP has good ferroelectric properties,as the remanent polarization and coercive field of piezoelectric fiber in free states are 85.4 μC/cm2 and 8.5 kV/cm,and it is also difficult to obtain saturated electric hysteresis loops. For the piezoelectric fiber sample casted with the polymer resin,the remanent polarization is only 39.2 μC/cm2,and the hysteresis loops are saturated. Clamping method has great impact on ferroelectric properties of the fiber. Leakage current test at high voltage of piezoelectric fiber shows that the residual polarization decreases after casting due to existence of leakage current.