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    STUDIA PHYSICA - Issue no. 2 / 2003  
         
  Article:   RELEASE BEHAVIOUR AND LOCAL STRUCTURE OF AG2O-CAO-BI2O3-B2O3 GLASSES.

Authors:  VIORICA SIMON, R. STEFAN, E. INDREA.
 
       
         
  Abstract:  Quaternary Ag2O-CaO-Bi2O3-B2O3 glasses are investigated with regard to release behaviour and local structure. The dissolution behaviour in water and physiological serum shows that the cations are released rapidly or gradually and points out a multi-step process generally characterised by higher rates in water than in physiological serum. The effect of silver addition to bismuth-borate glasses with low lime content on their structure is evidenced from X-ray scattering measurements. The addition of silver leads to a diminution of the atom packing in this system. The atoms from the third and forth coordination spheres occur in a less distorted configuration than in the precursor CaO-Bi2O3-B2O3 vitreous compound.  
         
     
         
         
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