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Transmission electron microscopy study of domain structures in ferroelectric SrBi2Nb2O9 ceramics

Published online by Cambridge University Press:  01 February 2011

C. Karthik ,
N. Ravishankar  and
K.B.R. Varma
C. Karthik
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560012, India.
N. Ravishankar
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560012, India.
K.B.R. Varma
Affiliation:
Materials Research Centre, Indian Institute of Science, Bangalore-560012, India.
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Abstract

A transmission electron microscopy study has been carried out on the domain structures of SrBi2Nb2O9 (SBN) ferroelectric ceramics which belong to the Aurivillius family of bismuth layered perovskite oxides. SBN is a potential candidate for Ferroelectric Random access memory (FeRAM) applications. The 90° ferroelectric domains and antiphase boundaries (APBs) were identified with dark field imaging techniques using different superlattice reflections which arise as a consequence of octahedral rotations and cationic shifts. The 90° domain walls are irregular in shape without any faceting. The antiphase boundaries are less dense compared to that of SrBi2Ta2O9(SBT). The electron microscopy observations are correlated with the polarization fatigue nature of the ceramic where the domain structures possibly play a key role in the fatigue- free behavior of the Aurivillius family of ferroelectric oxides.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 839: Symposium P – Electron Microscopy of Molecular and Atom-Scale Mechanical Behavior, Chemistry, and Structure , 2004 , P3.10
Copyright
Copyright © Materials Research Society 2004

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References

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