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The dielectric properties of (Na0.5Bi0.5)xSr1−xTiO3 (0 ≤ x ≤ 0.2) ceramic materials were studied from 10 to 300 K between 100 Hz and 1 MHz. At low substitution rates (0 ≤ x ≤ 0.02), two thermally activated relaxation modes were observed and attributed to non interacting dipoles. For x > 0.02, the highest temperature mode, independent on the composition, remains but its intensity decreases and eventually vanishes for x = 0.20. In addition the observed strong dispersion of the permittivity was connected with a relaxor behaviour the origin of which being due to the increasing density of interacting dipoles or dipole clusters. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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GOMAH-PETTRY et al. (2004) studied this question.
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