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<< JRScience Home     Volume 14 No.2   December 2003    << Back to Volume Home

STUDY OF OPTICAL BAND GAP OF ZINC-BORATE GLASSES 

M. Altaf, M. Ashraf Chaudhry and Maria Zahid

Department of Physics B. Z. University, Multan 60800, Pakistan. 

Abstract: The present study deals with binary xZnO-(100-x)B2O3 (x=50-60%) and ternary yV2O5-50ZnO-(50-y)B2O3 (y=5-10%) glass systems. The mass density, oxygen packing density, molar volume and optical energy gap of these glasses were measured at room temperature. The density varies in the range of 2.92 3.57 g/cm3. The absorption spectra of these glasses were recorded in the UV-visible range. The optical band gap energies for these glasses were estimated from absorption data using the Mott and Davis relation and found to be in the range of 1.14~2.92 eV. These results show that Eopt decreases with decreasing concentration of ZnO in binary glasses. In ternary glasses Eopt decreases with increasing concentration of V2O5 for a fixed amount of ZnO.

 

Keywords: Absorption spectra, borate glasses, optical energy gap, oxygen packing density.