Dielectric and pyroelectric studies on the Ba1-3aBi2aTiO3 classical and relaxor ferroelectric ceramics

Low frequency dielectric studies in the temperature range 80-500 K were performed on the solid solution derived from BaTiO3, Ba1-3aBi2aTiO3 with 0 < a < 0.117. The temperature and frequency variations of the real part of the relative permittivity show two different behaviors, depending upon the substitution rate. A classical ferroelectric behavior was observed for a varying approximately from 0 to 0.03. However, a relaxor behavior appears for higher values of a. The replacement of Ba2+ by Bi3+ in the A site shows a remarkable decrease of T-C. The dielectric studies were confirmed by pyroelectric study. (C) 2003 Published by Editions scientifiques et medicales Elsevier SAS.