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

He Yang; Zezhi Chen; Ranran Peng; Haoliang Huang; Zhengping Fu; Xiaofang Zhai; Yalin Lu

doi:10.1039/c8ra02374c

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

RSC Adv. 2018 May 8;8(30):16937-16946. doi: 10.1039/c8ra02374c. eCollection 2018 May 3.

Authors

He Yang¹, Zezhi Chen¹, Ranran Peng^{1

2}, Haoliang Huang^{1

2}, Zhengping Fu^{1

2}, Xiaofang Zhai^{2

3}, Yalin Lu^{1

2

3}

Affiliations

¹ CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China Hefei 230026 P. R. China yllu@ustc.edu.cn pengrr@ustc.edu.cn.
² Synergetic Innovation Center of Quantum Information & Quantum Physics, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China Hefei 230026 P. R. China.
³ National Synchrotron Radiation Laboratory, University of Science and Technology of China Hefei 230026 P. R. China.

Abstract

Aurivillius oxides with an intergrowth structures have been receiving increasing interest because of their special structures and potential outstanding ferroelectric properties. In this work, Bi₃LaTiNbFeO₁₂-Bi₅Ti₃FeO₁₅ and Bi₃TiNbO₉-Bi₃LaTiNbFeO₁₂ 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 Bi₃TiNbO₉-Bi₃LaTiNbFeO₁₂ and Bi₃LaTiNbFeO₁₂-Bi₅Ti₃FeO₁₅ compounds, respectively. A superlattice-like distortion in these oxides was proposed resulting from the combination of sub-lattices with different a and b 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 Bi₃TiNbO₉, Bi₃LaTiNbFeO₁₂ and Bi₅Ti₃FeO₁₅. Simultaneously, ferroelectric Curie temperatures of Bi₃TiNbO₉-Bi₃LaTiNbFeO₁₂ and Bi₃LaTiNbFeO₁₂-Bi₅Ti₃FeO₁₅ 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.