Study of Aging & De-Aging Behaviour in Un-Doped Polycrystalline Ferroelectric BaTiO_3

摘要

Aging and de-aging behavior of un-doped polycrystalline BaTiO_3 (BTO) is studied with the P-E measurements. The double hysteresis (P-E) loop is observed for the aged sample and it is observed that the relationship between the aging time and the developed internal bias field is similar to as that of reported for acceptor doped BTO and other ferroelectric materials in literature. However, the relaxation rates are quite different as compared to that of acceptor doped BTO. This is explained in terms of defect concentration. The de-aging behaviour is studied with different methods viz., thermal relaxation, combined use of temperature and applied electric field. Heating the sample slightly above its Tc and cooling in the presence of external applied dc- field is observed to completely remove the pinching and bring the internal bias field to zero.