Short-Circuit Current from the Axial-Mode Shock Depoling of PZT 56/44Ferroelectric Ceramic Disks.

摘要

Gas gun impact techniques have been used to investigate the electrical response of shock-depoled PZT 56/44 ferroelectric ceramic disks in the stress range from 0.7 to 8.8 GPa. External short-circuit current pulses were measured as the shock wave propagated axially through the disk in a direction either parallel or antiparallel to the remanent polarization vector. Complete charge release was not observed in any of the shots. About 82% of the available charge was released for both orientations in the stress range from 1.5 to 5.6 GPa. At stress levels of 6.8 and 8.8 GPa, the charge release for the antiparallel orientation shots was less than for the parallel orientation shots. A series of electrical polarization reversal measurements was performed under nonshock conditions on PZT disks to estimate the electrical properties in the region ahead of the shock front. Maximum electric fields for the regions ahead of and behind the shock front were estimated to be 1 to 6 kV/mm and 4 to 24 kV/mm, respectively, as the shock stress was increased. (Author)