Abstract
In this work, the frequency relaxation of the dielectric permittivity of BaBi 2 Ta 2 O 9 (BBT) and BaBi 2 Nb 2 O 9 (BBN) ceramics is investigated in the wide temperature range. Both compositions feature behavior typical for relaxor ferroelectrics including the strong frequency dispersion of the permittivity, the pronounced shift of its temperature maximum with frequency, and the absence of the macroscopic polarization even far below the dielectric peak temperature. The frequency dispersion of the real and imaginary parts of the permittivity is analyzed in the approximation of the uniform distribution of relaxation times. It is found that BBT has a narrower relaxation time spectrum, which broadens faster on cooling, as compared to that of BBN. It is suggested that such a behavior may result from the different level of cation substitution of Bi 3+ with Ba 2+ in both ceramics. The obtained parameters of relaxation spectra are compared with those of conventional relaxor ferroelectrics.
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