PHASE TRANSITION AND CURRENT PROPERTIES OF PZT 95/5-2NB FERROELECTRIC CERAMIC UNDER DYNAMIC LOADING

The high density ferroelectric ceramic with composition near Pb_0.99(Zr_0.95Ti_0.05)_0.98Nb_0.02O₃ (PZT 95/5-2Nb) has been studied under dynamic loading. To characterize its ferroelectric-to-antiferroelectric(FE/AFE) phase transition under shock wave compression, reverse-impact experiments were conducted to determine the Hugoniot states of poled and unpoled PZT 95/5-2Nb, and the shock-induced depoling currents were examined in an external circuit under short-circuit conditions for the poled PZT 95/5-2Nb. The Hugoniot data and current results identify that the phase transition of FE/AFE has occured in the stress range of 0.4 GPa~1.8 GPa. In the phase transition stress range, the measured short-circuit currents show the increasing of rise time and the decreasing of final levels with the increase of shock stress.