Superlattice-like structure and enhanced ferroelectric properties of intergrowth Aurivillius oxides.

Aurivillius oxides with an intergrowth structures have been receiving increasing interest because of their special structures and potential outstanding ferroelectric properties. In this work, BiLaTiNbFeO-BiTiFeO and BiTiNbO-BiLaTiNbFeO compounds were successfully synthetised using a simple solid-state reaction method. X-Ray diffraction patterns and scanning transmission electron microscopy high angle annular dark field (STEM-HAADF) images confirm the 2-3 and the 3-4 intergrowth structures in BiTiNbO-BiLaTiNbFeO and BiLaTiNbFeO-BiTiFeO compounds, respectively. A superlattice-like distortion in these oxides was proposed resulting from the combination of sub-lattices with different and parameters, which was validated by XRD refinements and Raman spectra. Polarization-electric field tests and pulsed polarization positive-up negative-down measurements demonstrate that such superlattice-like structures can effectively enhance the intrinsic ferroelectric polarization and coercive field of these oxides, especially when compared with their component oxides BiTiNbO, BiLaTiNbFeO and BiTiFeO. Simultaneously, ferroelectric Curie temperatures of BiTiNbO-BiLaTiNbFeO and BiLaTiNbFeO-BiTiFeO oxides are lowered because of the internal stress in the superlattice-like structure. Nevertheless, the paramagnetism of the samples is hardly influenced by their structure, while mainly related to their iron content, in which iron has a similar effective magnetic moment around 3.4-3.9.