Optical Properties of PVA/K2CrO4 Composite

Abstract

The change in the optical properties for samples of pure PVA and PVA/K2CrO4composite have been studied .The samples were prepared with different percentage(1,3,5,and 7)%wt of K2CrO4 by casting method technique .In this work ,we are study theabsorption ,reflectance spectra ,absorption coefficient, energy gap ,extinction coefficient ,andtransmittance spectra as a function of wavelength range (200-800)nm ,Also real andimaginary part of dielectric constant have been studied in the range of wave length .Theresults exhibit the optical properties change by the increase of K2CrO4 concentration, and thevalues of energy gap for indirect transitions decrease by the increase of the concentration ofK2CrO4.