Investigations on electrical, magnetic and optical behaviors of five-layered Aurivillius Bi6Ti3Fe2O18 polycrystalline films

• Published in: Thin solid films 2012-12, Vol.525, p.195-199
• Main Authors: Bai, W., Xu, W.F., Wu, J., Zhu, J.Y., Chen, G., Yang, J., Lin, T., Meng, X.J., Tang, X.D., Chu, J.H.
• Format: Article
• Language: English
• Subjects: Aurivillius compounds, multiferroics; Chemical solution deposition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric thin films; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Dispersions; Exact sciences and technology; Fittings; Magnetic properties; Magnetic properties and materials; Magnetic properties of monolayers and thin films; Magnetic properties of surface, thin films and multilayers; Mathematical models; Microstructure; Optical properties; Oscillators; Photons; Physics; Pyrolysis; Spectrometers; Thin films
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2012.10.058

Five-layered Aurivillius Bi6Ti3Fe2O18 (BTF2) polycrystalline thin films were prepared by a chemical solution deposition route. The crystalline structures and microstructures were characterized by X-ray diffractometer, micro-Raman spectrometer and atomic force microscopy. Its electrical and magnetic properties were investigated, and especially optical properties were addressed in detail. Coexistence of the ferroelectric and weak ferromagnetic properties indicated the multiferroic behavior of the BTF2 films. The optical dielectric functions in the photon energy range of 1.13–4.13eV have been extracted by fitting the experimental data in the light of the Tauc–Lorentz dispersion model. A direct interband transition with bandgap energy ~3.72eV was determined for the BTF2 films. The weak absorption below band-gap edge was explained by the Urbach band tail rule. Finally, the optical dispersion behaviors of the BTF2 films in the transparent oscillating region were described using a single oscillator model. ► Five-layered Aurivillius Bi6Ti3Fe2O18 (BTF2) thin films were prepared. ► Electrical and magnetic properties of the BTF2 films were investigated. ► Optical properties of the BTF2 films were especially addressed in detail.