Determination the dispersion parameters and urbach tail of iron chromate doped PMMA films | ||
| Iraqi Journal of Physics | ||
| Article 1, Volume 10, Issue 17, April 2012, Pages 12-17 | ||
| Authors | ||
| Muhammad Hameed Abdul-Allah; Nadir Fadhil Habubi; Sami Salman Chiad | ||
| Abstract | ||
| Films of pure Poly (methyl methacrylate) PMMA and Iron chromate doped PMMA have been prepared using casting method. Transmission and absorptance spectra have been recorded in the wavelength range (300-900) nm, in order to calculate, single oscillator energy, dispersion energy proposed by Wemple - DiDomenico model, average oscillator strength, average oscillator wavelength. The refractive index data at infinite wavelength which was found to obey single oscillator model which was found to increase from 2.27-2.56 as the doping percentage increase. The decreasing in the optical energy gap which was found according to Tauc model were (3.74-3.63) eV , is in good agreement with that obtained by wimple-DiDomenico model. The inverse behavior compared with the value of the energy gap were obtained for Urbach energies by increasing from (266-308) meV upon doping. | ||
| Keywords | ||
| PMMA; Optical Properties; Casting Method; Doping Effect | ||
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