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Dielectric and ferroelectric properties of lead‐free Ba 1− x La x Ti 1− x Fe x O 3 ceramics
Author(s) -
Chaabane H.,
Abdelmoula N.,
Khemakhem H.,
Simon A.,
Michau D.,
Maglione M.
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201026083
Subject(s) - dielectric , materials science , ceramic , hysteresis , perovskite (structure) , ferroelectricity , piezoelectricity , phase (matter) , diffraction , phase transition , analytical chemistry (journal) , condensed matter physics , ferroelectric ceramics , mineralogy , crystallography , composite material , chemistry , optics , optoelectronics , physics , chromatography , organic chemistry
Perovskite types Ba 1− x La x Ti 1− x Fe x O 3 (with 0 ≤ x ≤ 0.15) ceramics have been prepared through a solid‐state reaction route. The room‐temperature X‐ray diffraction study suggests that all the compositions have single phase. A broad dielectric anomaly coupled with the shift of dielectric maxima toward a higher temperature with increasing frequency indicates the relaxor‐type behavior in some ceramics. The relaxor ceramics obtained obey the Vogel–Fulcher law. The partial replacement of Ba 2+ by La 3+ and Ti 4+ by Fe 3+ shows a remarkable decrease of T C . The P – E hysteresis measurement proves the ferroelectric character of these compounds. The piezoelectric constant d 31 of about 33.7 pC N −1 was observed for Ba 0.95 La 0.05 Ti 0.95 Fe 0.05 O 3 ceramic.