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Effect of annealing temsperature on some optical properties of LiF thin films | ||
| Diyala Journal For Pure Science | ||
| Article 1, Volume 7, Issue 4, 2011, Pages 130-138 | ||
| Author | ||
| Nedhal A. Mahmood | ||
| Abstract | ||
| LiF Polycrystalline thin films have been prepared by using thermal evaporation technique on substrates of glass heated at room temperature under vacuum of (10-6mb) and the thickness of films was ( 400 nm ). After that the films were treated thermally at pressure ( 10-3 mb) and a temperature of (323 K ) ,(423 K ) and (473 K) for one hour.The optical measurements which is included the absorbance spectra using UV-VIS spectroscopy in the spectrum range ( 250-850 )nm demonstrated that the values of the absorption coefficient ( α ) was greater than ( 104cm-1) and then ( α ) decreases with increasing of annealing temperature ( Ta ). Moreover, the absorbance spectra were used to find some optical constants such as refractive index ( n ), extinction coefficient ( k ) and dielectric constant ( ε ), and it was found that the optical constants were affected after treating the films thermally. | ||
| Keywords | ||
| LiF; thin films; absorption coefficient; Annealing Temperature; refractive index | ||
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