Ferroelectric relaxor behaviour of Na0.5Bi0.5TiO3-SrTiO3 ceramics
authors Gomah-Pettry, JR; Salak, AN; Marchet, P; Ferreira, VM; Mercurio, JP
nationality International
journal PHYSICA STATUS SOLIDI B-BASIC RESEARCH
keywords SODIUM-BISMUTH TITANATE; PHASE-TRANSITIONS; DIELECTRIC-PROPERTIES; DOPED SRTIO3; SYSTEM; MODES; LEAD; RELAXATION; CRYSTALS; STRAIN
abstract The dielectric properties of (Na0.5Bi0.5)(x)Sr1-xTiO3 (0 less than or equal to x less than or equal to 0.2) ceramic materials were studied from 10 to 300 K between 100 Hz and 1 MHz. At low substitution rates (0 less than or equal to x less than or equal to 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. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
publisher WILEY-V C H VERLAG GMBH
issn 0370-1972
year published 2004
volume 241
issue 8
beginning page 1949
ending page 1956
digital object identifier (doi) 10.1002/pssb.200302020
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000222618200023
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