Piezoelectricity and local structural distortions in (Na{sub 0.5}Bi{sub 0.5}){sub 1-x}Sr{sub x}TiO{sub 3}-Bi{sub 12}TiO{sub 20} flexoelectric-type polar ceramics

Journal Article · Mon Aug 06 04:00:00 EDT 2012 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4744952· OSTI ID:22089358

Wang, L. H.; Zhao, M. L.; Wang, C. L.; Wang, J.; Kuai, W. J.; Tao, X. T. ^[1]

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1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 (China)

We have previously described sintered Na{sub 0.5}Bi{sub 0.5}TiO{sub 3}-Bi{sub 12}TiO{sub 20} composites as flexoelectric-type polar ceramics because they have a net macroscopic flexoelectric polarization. Here, we report on the universal existence of the macroscopic flexoelectric polarization in the (Na{sub 0.5}Bi{sub 0.5}){sub 1-x}Sr{sub x}TiO{sub 3}-Bi{sub 12}TiO{sub 20} system, in which enhanced piezoelectricity is observed. By combining Raman spectroscopy and x-ray photoelectron spectroscopy techniques, we have identified the local flexoelectric polarization as distorted BiO{sub 5} polyhedra and TiO{sub 6} octahedra in the SrTiO{sub 3}-Bi{sub 12}TiO{sub 20} ceramic. The macroscopic polarization may be due to the partial alignment of these distorted units located within the grain boundary amorphous phases. Bi{sub 12}TiO{sub 20} could have an important role in these flexoelectric-type polar ceramics.

• OSTI ID: 22089358
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 6 Vol. 101; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMORPHOUS STATE
BISMUTH COMPOUNDS
CERAMICS
COMPOSITE MATERIALS
DIELECTRIC MATERIALS
GRAIN BOUNDARIES
PIEZOELECTRICITY
POLARIZATION
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SINTERING
SODIUM COMPOUNDS
STRONTIUM TITANATES
TITANATES
X-RAY PHOTOELECTRON SPECTROSCOPY