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    STUDIA PHYSICA - Issue no. 1 / 2001  
         
  Article:   RAMAN SPECTROSCOPIC INVESTIGATION OF THE 3B2O3-K2O-V2O5-CUO GLASSES.

Authors:  D. MANIU, I. ARDELEAN, SIMONA CINTĂ PÂNZARU, T. ILIESCU, WOLFGANG KIEFER. 		 
       
         
  Abstract:  The influence of V2O5CuO content on the structure of 3B2O3K2O glass was investigated by Raman spectroscopy. With increasing vanadium and copper content the number of non-bridging oxygen increases and the glass structure becomes more randomised. For the V2O5CuO concentration higher than x = 0.03, borate and boroxol rings are broken and the orthoborate groups are formed. Further addition of V2O5CuO determines the appearance of "loose" tetrahedra and for x > 0.1 the decrease of orthoborate groups number. A small number of chain-type metaborate and pyroborate groups are also present in this glass. Therefore, we conclude that the vanadium and copper ions act as network modifier in these glasses.  
         
     
         
         
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