Dielectric, ferroelectric and piezoelectric properties of Bi0.5Na0.5TiO3–(Ba0.7Ca0.3)TiO3 ceramics at morphotropic phase boundary composition

(1−x)Bi0.5Na0.5TiO3–x(Ba0.7Ca0.3)TiO3 (BNT–xBCT, 0≤x≤0.15) solid solutions have been synthesized by a conventional solid state sintering method for obtaining a morphotropic phase boundary (MPB) with good piezoelectric properties. X-ray diffraction patterns reveal that a MPB of rhombohedral and tetra...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2011-02, Vol.176 (3), p.260-265
Main Authors: Yang, Jingna, Liu, Peng, Bian, Xiaobing, Jing, Huixia, Wang, Yajuan, Zhang, Yu, Wu, Yi, Song, Wuhui
Format: Article
Language:English
Subjects:
Bi0.5Na0.5TiO3
Ceramics
Coercive force
Dielectric
Dielectric properties
Dispersions
Ferroelectric
Ferroelectricity
Materials science
Morphotropic phase boundary
Phase boundaries
Piezoelectric
Piezoelectricity
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Summary:(1−x)Bi0.5Na0.5TiO3–x(Ba0.7Ca0.3)TiO3 (BNT–xBCT, 0≤x≤0.15) solid solutions have been synthesized by a conventional solid state sintering method for obtaining a morphotropic phase boundary (MPB) with good piezoelectric properties. X-ray diffraction patterns reveal that a MPB of rhombohedral and tetragonal phases is formed at compositions 0.09≤x≤0.12. Addition of BCT into BNT greatly lowered coercive field Ec without degrading remanent polarization Pr. The specimen with x=0.09 has the good piezoelectric properties: d33=125pC/N and kp=0.33. A modified Curie–Weiss law was used to fit the dielectric constant of BNT–xBCT ceramics, and a frequency dispersion was observed during the phase transitions from antiferroelectric to paraelectric in specimens with x exceeding 0.06.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2010.12.007