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    STUDIA PHYSICA - Issue no. 2 / 2005  

Authors:  S. SIMON, M. TODEA.
  Abstract:  Fourier transform infrared (FTIR) spectroscopic results were used to investigate the changes induced in the local structure of samples as the ratio between Bi2O3 and SiO2 content changes from 3:1 to 2:3. The environment of constituent cations was investigated both in vitreous and partially crystallised samples of same composition. Progressive substitution of Bi2O3 by SiO2 contributes to the structural relaxation of vitreous network and enhances glass stability. By crystallisation heat treatment the structural units appear to be more uniform as results from the narrowing of corresponding IR bands. FTIR results show that more affected by composition and heat treatment is the environment of bismuth than that of silicon.  
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