Dielectric relaxation in Ba0.96Bi0.04Ti0.96Fe0.04O3

Samples of Ba0.96Bi0.04Ti0.96Fe0.04O3 were prepared by a solid state reacti on method. Data on the dielectric constant as a function of temperature and frequency were obtained in the temperature range 35-180 degrees C at 10 an d 100 kHz. The material shows a diffuse phase transition. With increasing f requency, the transition temperature shifts towards lower temperature, rese mbling that of a relaxor ferroelectric with a negative shift in T-c. Impeda nce analysis confirms the relaxor behavior. (C) 1998 American Institute of Physics. [S0021-8979(98)07923-7].