1. Ferroelectric and optical properties of Bi3.25Nd0.75Ti3O12thin films prepared by a chemical solution method
- Author
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Fuwen Shi, Jinlan Sun, Junhao Chu, Jianhua Ma, Tie Lin, and Xiangjian Meng
- Subjects
Permittivity ,Materials science ,Acoustics and Ultrasonics ,Band gap ,business.industry ,Dielectric ,Molar absorptivity ,Condensed Matter Physics ,Ferroelectricity ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Optics ,Dissipation factor ,Optoelectronics ,Thin film ,business ,Refractive index - Abstract
The ferroelectric and optical properties of Bi3.25Nd0.75Ti3O12 thin films deposited on (111)Pt/Ti/SiO2/Si substrates using a chemical solution method were investigated. Bi3.25Nd0.75Ti3O12 thin films were polycrystalline and had (117) random orientation with large rod-like grains. They showed good ferroelectricity with a remnant polarization of 13.8 µC cm−2 and a coercive field of 120 kV cm−1. The dielectric constant and the dissipation factor were about 200 and 0.040, respectively, at a frequency of 10 kHz. No polarization fatigue was observed for the Pt/Bi3.25Nd0.75Ti3O12/Pt capacitor after 109 switching cycles. The optical constants (refractive index and extinction coefficient) in the wavelength range of 200–1700 nm were obtained by spectroscopic ellipsometry measurements. The optical band gap was estimated to be about 3.61 eV. The dispersion of the refractive index in the interband transition region followed the single electronic oscillator model.
- Published
- 2004