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    STUDIA PHYSICA - Issue no. 2 / 2003  
         
  Article:   STRUCTURAL STABILITY OF SOME PHOSPHATE GLASSES.

Authors:  S. SIMON, D. CACAINA, I. BALASZ.
 
       
         
  Abstract:  Glasses of x (Nb2O5•Li2O)(100-x)[P2O5•CaO] system with 0 £ x £ 20 mol % were investigated by differential thermal analysis (DTA). Thermal differential data obtained at different heating rate were used to determine the activation energy of crystallisation (Et), while the thermal stability was appreciated at same heating rate for all samples. DTA results lead to close values for the activation energy for both x = 1 and 5 mol % and a clearly higher value for x = 3 mol %. The highest glass stability was also obtained for x = 3 mol % and decreases by further addition of Nb2O5 and Li2O up to x = 20 mol %.  
         
     
         
         
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