Direct evidence of correlations between relaxor behavior and polar nano-regions in relaxor ferroelectrics: A case study of lead-free piezoelectrics Na{sub 0.5}Bi{sub 0.5}TiO{sub 3}-x%BaTiO{sub 3}

Diffuse scattering and relaxor behavior in Na{sub 0.5}Bi{sub 0.5}TiO{sub 3} (NBT) and NBT-5.6 at. %BaTiO{sub 3} (NBT-5.6%BT) were investigated. X-ray diffraction revealed two types of diffuse scattering in NBT: (i) broad and (ii) asymmetric L-shaped. After modification with 5.6%BT, the broad diffuse...

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Bibliographic Details
Published in:Applied physics letters 2013-12, Vol.103 (24)
Main Authors: Ge, Wenwei, Luo, Chengtao, Devreugd, Christopher P., Li, Jiefang, Viehland, D., Zhang, Qinhui, Luo, Haosu, Ren, Yang
Format: Article
Language:English
Subjects:
ASYMMETRY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATIONS
DIFFUSE SCATTERING
ELECTRIC FIELDS
FERROELECTRIC MATERIALS
MATERIALS SCIENCE
PERMITTIVITY
PIEZOELECTRICITY
SYMMETRY
TITANATES
X-RAY DIFFRACTION
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Summary:Diffuse scattering and relaxor behavior in Na{sub 0.5}Bi{sub 0.5}TiO{sub 3} (NBT) and NBT-5.6 at. %BaTiO{sub 3} (NBT-5.6%BT) were investigated. X-ray diffraction revealed two types of diffuse scattering in NBT: (i) broad and (ii) asymmetric L-shaped. After modification with 5.6%BT, the broad diffuse scattering patterns became narrow, and the asymmetric L-shaped ones were replaced by symmetric ones. The symmetric diffuse scattering in NBT-5.6%BT disappeared with increasing dc electric field (E) for E ≥ 9.5 kV/cm where the frequency dispersion in the dielectric constant disappeared. These results demonstrate that the relaxor characteristics are directly correlated with the diffuse scattering and the presence polar nano-regions.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4846655