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Effect of poling on polarization alignment, dielectric behavior, and piezoelectricity development in polycrystalline BiFeO 3 –BaTiO 3 ceramics
Author(s) -
Cao Lei,
Zhou Changrong,
Xu Jiwen,
Li Qinglin,
Yuan Changlai,
Chen Guohua
Publication year - 2016
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.201532373
Subject(s) - poling , dielectric , materials science , piezoelectricity , condensed matter physics , electric field , polarization (electrochemistry) , dipole , curie temperature , piezoelectric coefficient , crystallite , polarization density , ceramic , ferroelectricity , composite material , magnetic field , magnetization , optoelectronics , physics , ferromagnetism , chemistry , metallurgy , quantum mechanics
This study investigates the effect of poling electric field on polarization alignment, dielectric dispersion, relaxor feature, phase transition temperature ( T m ), and piezoelectric properties evolution of (1– x )BiFeO 3 – x BaTiO 3 [(1– x )BF– x BT] ceramics with x = 0.26, 0.29, 0.32, and 0.35. The XRD pattern studies indicate that the application electric field induced the polarization alignment along with a significant change of the diffraction intensity of peaks, which gives rise to increasing piezoelectric properties. Simultaneously, the degree of dielectric dispersion and diffuse factor γ in the modified Curie–Weiss equation and T m increase after applying the poling electric field. Moreover, the relaxor characteristics are more evident with increasing BT content. The dielectric behavior and relaxor feature may be attributed to the small random field domains resulting from local charge imbalance due to off‐valent substituents between A‐ and B‐site cation in (1– x )BF– x BT ceramics. Meanwhile, the application of the poling electric field probably increases the strength of the neighboring dipole–dipole interaction, giving the enhanced degree of dielectric dispersion and T m .