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    STUDIA PHYSICA - Issue no. Sp. Issue / 2003  
         
  Article:   THE INFLUENCE OF B2O3- BI2O3 VITREOUS MATRIX ON COPPER IONS EPR ABSORPTION SPECTRA.

Authors:  R. STEFAN, S. SIMON.
 
       
         
  Abstract:  Results of EPR investigations performed on glasses from (100-y)[(xB2O3(1-x) Bi2O3]yCuO system with 0.07  x  0.8 and y = 0.5 and 1 mol % are reported. The changes in EPR spectra point out the modification of the copper ions vicinity due to the variation of the B2O3/Bi2O3 ratio in the glass matrix. The hyperfine structure is observed in the parallel band only for samples with high boron oxide content wherein the Cu2+ paramagnetic ions can be disposed in sites of octahedral symmetry, while in the samples with high bismuth oxide content Cu2+ ions are experiencing a more disordered surrounding.  
         
     
         
         
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