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    STUDIA PHYSICA - Issue no. 2 / 2006  
         
  Article:   LOCAL STRUCTURE OF 3B2O3-PBO-AG2O BASED GLASSES ANALYZED THROUGH RAMAN SPECTROSCOPY.

Authors:  I. ARDELEAN, R. CICEO-LUCACEL, A.O. HULPUS.
 
       
         
  Abstract:  Glasses from xCuO(1-x)[3B2O3(1-y)PbOyAg2O] (0 x 0.1 and y = 0.1, 0.3) system were prepared and studied by means of Raman scattering. For both systems were found bands characteristic to borate based glasses structure such as: boroxol rings, diborate, pyroborate and metaborate groups. It was evaluated the influence of both Ag2O/PbO ratio and CuO variation on the short-range order (SRO) of the network in order to obtain information concerning the local structure of copper-doped 3B2O3-PbO-Ag2O glass matrices. Increasing the Ag2O/PbO ratio induces a higher degree of glass network disorder. Controlled addition of cooper ions determined a decrease in the intensity of the borate Raman bands for both systems denoting a progressively disorder of their vitreous network.  
         
     
         
         
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