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Unusually soft ferroelectricity in (Ba 1− x Sr x )TiO 3 ceramics
Author(s) -
Wang Le,
Wang Xiaoli,
Shi Jing,
Sun Ruiting,
Li Bo
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.201127086
Subject(s) - ferroelectricity , materials science , dielectric , octahedron , ceramic , polarization (electrochemistry) , ferroelectric ceramics , phase transition , permittivity , condensed matter physics , atmospheric temperature range , mineralogy , analytical chemistry (journal) , crystallography , crystal structure , optoelectronics , chemistry , physics , composite material , thermodynamics , chromatography
Temperature evolution of polarization versus electric field of (Ba 0.4 Sr 0.6 )TiO 3 and (Ba 0.9 Sr 0.1 )TiO 3 ceramics was investigated. Polarization characteristics of (Ba 0.9 Sr 0.1 )TiO 3 belong to ferroelectrics with diffuse phase transition (DPT), while the ones of (Ba 0.4 Sr 0.6 )TiO 3 are rather different. (Ba 0.4 Sr 0.6 )TiO 3 ceramics display very soft ferroelectricity and extremely high dielectric tunability. The long‐range ferroelectric ordering in (Ba 0.4 Sr 0.6 )TiO 3 ceramics disappears completely below temperature T m of maximum dielectric permittivity ε m , which is different from normal DPT ferroelectrics. The special ferroelectric behavior is hypothesized to be attributed to random arrangements of the distorted TiO 6 octahedra.