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Advances in Condensed Matter Physics
Volume 2012 (2012), Article ID 714625, 10 pages
http://dx.doi.org/10.1155/2012/714625
Review Article

Ferroelectric Instability and Dimensionality in Bi-Layered Perovskites and Thin Films

Department of Physics, Hokkaido University, Sapporo 060-0810, Japan

Received 25 May 2012; Accepted 3 August 2012

Academic Editor: Biljana Stojanovic

Copyright © 2012 Akira Onodera et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The dielectric and thermal properties of Bi (bismuth)-layered perovskite SrBi2Ta2O9 (SBT) are discussed in comparison with ferroelectric thin BaTiO3 films. Although these two perovskites exhibit quite a different nature, the dielectric properties of BaTiO3 thin film are similar to those in bulk SBT. The dielectric properties and pseudo-two-dimensional structure between SBT and thin film suggest that the bulk layered ferroelectric SBT is a good model of ultra-thin ferroelectric film with two perovskite layers, free from any misfit lattice strain with substrate and surface charge at the interface with electrodes. Based on the mechanism of ferroelectric phase transition of SBT, it seems plausible that the ferroelectric interaction is still prominent but shows a crossover from ferroelectric to antiferroelectric interaction in perovskite ultra-thin films along the tetragonal axis.