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    STUDIA PHYSICA - Issue no. 1 / 2002  
         
  Article:   NUCLEAR MAGNETIC RESONANCE INVESTIGATION OF BISMUTH-BORATE GLASSES.

Authors:  S. SIMON, M. VASILESCU.
 
       
         
  Abstract:  Bismuth-borate glasses belonging to xBi2O3 (100-x)B2O3 system, 0 <= x <= 93, doped with 0. 5 mol % MnO are investigated by magic angle spinning nuclear magnetic resonance (MAS NMR). The 11B MAS NMR results indicate the presence of tetra coordinated boron in all investigated bismuth borate glasses, with a large maximum in the range 20 <= x <= 60. The mean values of the NMR parameters like chemical shift, asymmetry parameter and quadrupolar coupling constant are less influenced by the bismuth/boron ratio, showing that boron structural units are relatively stable on entire investigated composition range.  
         
     
         
         
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