Direct Determination of Cationic Disordering in Sodium Bismuth Titanate

Si-Young Choi; Yuichi Ikuhara

https://doi.org/10.9729/AM.2012.42.3.164

Applied Microscopy 2012;42:164-73

Published online September 30, 2012

Si-Young Choi^*, Yuichi Ikuhara¹

Korea Institute of Materials Science (KIMS), Changwon 642-831, Korea ¹Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan

Correspondence to: Choi SY, Tel: +82-55-280-3514 Fax: +82-55-280-3699 E-mail: youngchoi@kims.re.kr

Received August 11, 1900; Revised September 6, 1900; Accepted September 10, 1900.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract: The relaxor ferroelectric feature in lead-free perovskite oxides, where the dipoles are randomly oriented and they can be feasibly aligned parallel to the external bias, is attracting lots of attention in the field of piezoelectric materials science, since it is one of candidates to replace the toxic lead-based materials that are still being commercially used. However, the origin of relaxor characteristic and its related atomic structure are still ambiguous. In this study, Na1/2Bi1/2TiO3, chosen as a model relaxor system, was found to exhibit a cationic-disordered atomic structure; and furthermore the nonpolar atomic structure and its related oxygen tilting were ascertained via annular bright field imaging skill. We also found that this cationic disordering gives rise to the local formation of atomic
vacancies.; Keywords : Sodium bismuth titanate, Point defect, Relaxor, Ferroelectric, Aberrationcorrected STEM

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