PHASE-TRANSITIONS IN PZT-95 5 CERAMICS STUDIED BY DIELECTRIC AND PYROELECTRIC MEASUREMENTS - UNUSUAL PROPERTIES IN THE VICINITY OF THE ANTIFERROELECTRIC-FERROELECTRIC PHASE-TRANSITION/

The antiferroelectric-two ferroelectric (F-R(LT)-F-R(HT))-paraelectric phase sequence was ascertained in PZT-95/5 ceramics. Unusual behaviou r of the temperature characteristics of electric permittivity, tan del ta, remanent polarization and pyroelectric current was observed in the range of diffuse transition between the AFE and FE phases. The influe nce of external and internal bias electric fields as a possible reason for this behaviour is discussed.