The electrostrictive effect and dielectric properties of lead-free 0.5Ba(ZrxTi1−x)O3–0.5(Ba0.75Ca0.25)TiO3 ceramics

Lead-free 0.5Ba(Zr x Ti 1−x )O 3 –0.5(Ba 0.75 Ca 0.25 )TiO 3 (x = 0.25, 0.30, 0.35, 0.40) ceramics have been synthesized by a conventional solid state sintering method. The room temperature ferroelectric and electrostrictive properties of these ceramics were studied. Based on the measured properties...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2013-08, Vol.24 (8), p.2653-2658
Main Authors: Xiao, Fei, Ma, Weibing, Sun, Qingchi, Huan, Zhengli, Li, Jianping, Tang, Cuicui
Format: Article
Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Electronics
Exact sciences and technology
Ferroelectricity and antiferroelectricity
Materials
Materials Science
Optical and Electronic Materials
Permittivity (dielectric function)
Physics
Piezoelectricity and electromechanical effects
Review
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Summary:Lead-free 0.5Ba(Zr x Ti 1−x )O 3 –0.5(Ba 0.75 Ca 0.25 )TiO 3 (x = 0.25, 0.30, 0.35, 0.40) ceramics have been synthesized by a conventional solid state sintering method. The room temperature ferroelectric and electrostrictive properties of these ceramics were studied. Based on the measured properties, these ceramics showed a typical relaxor behavior. The Curie temperature of BZT–BCT ceramics decreases with increasing the Zr content. The largest electrostrictive strain and electrostrictive coefficient are founded in BZT–BCT ceramic with x = 0.25, the value is 0.16 % and 0.079 m 4  C −2 , respectively. The polarization, electrostrictive strain and electrostrictive coefficient ( Q 11 ) decrease with increase in Zr concentration. For samples with low Curie temperature, which have large room temperature dielectric constant ( ε ), electrostrictive coefficient increases ( Q 11 ) is smaller. Because doping can disrupt the long range cation order, and electrostrictive ( Q 11 ) coefficient increases with cation order from disordered, through partially-ordered, simple relaxor and then ordered perovskites, ferroelectrics with a disordered structure have a huge permittivity, but a small electrostrictive coefficient ( Q 11 ).
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-013-1176-4