EFFECTS OF IRON ADDITION ON AGING BEHAVIOR OF BARIUM TITANATE CERAMICS UNDER COMPRESSIVE STRESS

摘要

In this study, a room temperature aging behavior of Ba(Ti_(0.99)Fe_(0.01))O_3 was investigated. It was found that the dielectric constant decreased with time and ferroelectric P-E hysteresis loops became constricted loops after aging. Moreover, the room temperature aging behavior under various stresses was also observed. It was found that the relative changes of dielectric constant with time of Ba(Ti_(0.99)Fe_(0.01))O_3 ceramics under stress were lower than those under the stress-free condition. For P-E hysteresis loop measurement, it can be observed that P-E hysteresis loop of Ba(Ti_(0.99)Fe_(0.01))O_3 ceramics became constricted loops and remanant polarizations (P_r), saturated polarizations (P_s) were decreased after aging under all stress levels. These results suggested that the applied stress may partly clamp the domain wall motion, and altered the aging behavior of the ceramics.