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    STUDIA PHYSICA - Issue no. 1 / 2001  
         
  Article:   EPR INVESTIGATION OF THE FE2O3-BI2O3-PBO-AS2O3 GLASS SYSTEM.

Authors:  M. PETEANU, C. BORÅžA, I. ARDELEAN.
 
       
         
  Abstract:  Glasses of the system xFe2O3•(100-x)[Bi2O3•PbO•As2O3] where prepared for 0  x  30 mol %. Structural changes of the vitreous matrix and the concentration dependence of the paramagnetic ions distribution were revealed by means of EPR of Fe3+ ions. Valence states distribution of the iron impurities was also evidenced as depending on Fe2O3 content of the glass.  
         
     
         
         
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