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    STUDIA PHYSICA - Issue no. 2 / 2006  
         
  Article:   THE STRUCTURE OF CUO – P2O5 – CAF2 GLASS SYSTEM.

Authors:  N. VEDEANU, O. COZAR, I. ARDELEAN, D.A. MAGDAS. 		 
       
         
  Abstract:  XCuO(1-x)[P2O5•CaF2] glass system with 0 ≤ x ≤ 20%mol was prepared and investigated by means of Raman and EPR spectroscopy in order to evidence the structural changes induced by the copper oxide in different ratio and its modifier role. Raman spectra of the studied glasses contain the typical bands attributed to the phosphate glasses. It can be observed that the band at ~1020 cm-1 attributed to PO2 and PO3 groups increase in intensity as the phosphate chain breaks and so a bigger number of PO2 and PO3 are formed. The bands at ~1170 cm-1 and 1270 cm-1 belonging to the symmetric and asymmetric stretching vibrations in PO2 groups decrease in intensity with increasing the CuO content and this fact is consistent with the depolymerization of the three dimension phosphate network. EPR results obtained for copper doped glasses show g┴  
         
     
         
         
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