Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8001127 | Journal of Alloys and Compounds | 2014 | 5 Pages |
Abstract
0.5BaZr0.2Ti0.8O3-0.5Ba0.7Ca0.3TiO3 thin films have been deposited on Pt/Ti/SiO2/Si substrates by a modified sol-gel technique. The samples are well-crystallized perovskite ferroelectrics at room temperature, with good surface topography. Optical properties of these films in the 280-850Â nm wavelength range have been investigated by spectroscopic ellipsometry at room temperature. The measured ellipsometry parameters are well fitted by Tauc-Lorentz oscillator dispersion formula. As the wavelength increases, the refractive index and extinction coefficient rise in the beginning and then descend, with a peak at about 300Â nm. The calculated absorption coefficient demonstrates that as-grown films have selective absorption, with a broad transparent range, and possess a big energy gap (4.18Â eV).
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Hongguang Wang, Jinbao Xu, Chao Ma, Fanglong Xu, Lei Wang, Liang Bian, Aimin Chang,