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    STUDIA PHYSICA - Issue no. 2 / 2006  
         
  Article:   RAMAN SPECTROSCOPY OF LEAD-PHOSPHATE GLASSES WITH IRON IONS.

Authors:  D.A. MAGDAS, O. COZAR, I. ARDELEAN, N. VEDEANU. 		 
       
         
  Abstract:  The structure of xFe2O3∙(100-x)[2P2O5∙PbO] glass system with 0≤x≤10 mol% was investigated by Raman spectroscopy. The characteristic bands of these glasses due to the stretching and bending vibrations were identified and analyzed by the increasing of Fe2O3 content. This fact allowed us to identify the specific structural units which appear in these glasses and to deduce the role of the Fe2O3 oxide on the structural changes of 2P2O5∙PbO network. At high Fe2O3 content a depolymerization of the phosphate network appears and the short phosphate chain units or ring structures are formed, too.  
         
     
         
         
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