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Giant dielectric and ferromagnetic response in Ba 0.4 Sr 0.6 Ti 1− y Co y O 3 ceramics
Author(s) -
Zhang Jingji,
Liu Jintao,
Huang Xia,
Lin Xuecheng,
Wang Jiangying
Publication year - 2012
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.201228218
Subject(s) - dielectric , materials science , arrhenius equation , ferromagnetism , ceramic , condensed matter physics , relaxation (psychology) , ferroelectricity , analytical chemistry (journal) , dielectric loss , nuclear magnetic resonance , mineralogy , activation energy , chemistry , composite material , physics , psychology , social psychology , optoelectronics , chromatography
Abstract Ba 0.4 Sr 0.6 Ti 1− y Co y O 3 ceramics show a diphase of Ba 1− x Sr x TiO 3 and 6H‐hexagonal BaTi 1− y Co y O 3 . As y increases, Ba 0.4 Sr 0.6 Ti 1− y Co y O 3 ceramics experience a transformation from ferroelectric to relaxor‐like behavior. For the samples with y ≥ 0.10, the dielectric constant exhibits relaxor‐like behavior with the frequency‐dependent temperature of the dielectric peak T m following an Arrhenius law, accompanying a giant dielectric response. The dielectric relaxation with an extremely high dielectric peak is attributed to charge ordering and defects. The samples with low Co levels ( y ≤ 0.05) exhibit dielectric nonlinear behavior, whereas those with high Co levels ( y ≥ 0.10) have ferromagnetic properties.