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http://dx.doi.org/10.9729/AM.2012.42.3.164

Direct Determination of Cationic Disordering in Sodium Bismuth Titanate  

Choi, Si-Young (Korea Institute of Materials Science (KIMS))
Ikuhara, Yuichi (Institute of Engineering Innovation, The University of Tokyo)
Publication Information
Applied Microscopy / v.42, no.3, 2012 , pp. 164-173 More about this Journal
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, $Na_{1/2}Bi_{1/2}TiO_3$, 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; Aberration-corrected STEM;
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