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- Title
Study of amorphous and crystalline phases of sodium bismuth titanate thin films by optical and Raman spectroscopy.
- Authors
Joseph, Andrews; Goud, J.; Emani, Sivanagi; Raju, K.
- Abstract
Amorphous and crystalline NaBiTiO (NBT) thin films were deposited at different substrate temperatures on fused silica by plused laser deposition method. The phase and microstructure of the deposited films were investigated by XRD and FE-SEM respectively. The noticeable difference is observed in the Raman and optical spectra of amorphous and crystalline films. To grasp further insight, the dispersion data of the refractive index is fitted with the single oscillator model. The oscillator strength and oscillator energy are computed. The refractive index of NBT thin films decrease with increase in wavelength and approach a constant value in long wavelength limit while extinction coefficient increase with increase in wavelength. In Raman spectra of amorphous materials, many Raman peaks coalesce and form very broad spectral bands, whereas the polycrystalline material shows distinct band.
- Subjects
BISMUTH titanate; THIN films; RAMAN spectroscopy; WAVELENGTHS; RAMAN spectra
- Publication
Journal of Materials Science: Materials in Electronics, 2017, Vol 28, Issue 5, p4362
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-016-6062-4