Abstract
The dc-electric-field dependence of the dielectric properties (complex permittivity and relaxation time) of the antiferroelectric was investigated at 4.5 kbar under various frequencies. The strong dielectric dispersion along the b axis associated with the field-enforced ferroelectric phase transition was observed. The slowing down of the relaxation time toward a critical electric field , which induces the forced transition to the ferroelectric phase, was observed. Although the dielectric dispersion strength is zero without an applied dc field , with an increase in it increases gradually, rapidly near in the antiferroelectric phase and decreases monotonically in the ferroelectric phase. The relaxation time of the order of s near in the antiferroelectric phase for the field-enforced transition is extremely low in contrast to that of the order of s near the transition temperature in the paraelectric phase for the paraelectric-ferroelectric phase transition.
- Received 4 May 1990
DOI:https://doi.org/10.1103/PhysRevB.42.4893
©1990 American Physical Society