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    STUDIA PHYSICA - Issue no. Sp. Issue / 2003  

Authors:  S. SIMON.
  Abstract:  Vitreous samples belonging to (100-x)[4Bi2O3PbO]xMO system, where MO = Fe2O3, MnO or Gd2O3 and x = 1, 5, 10 and 20 mol %, were obtained by quickly undercooling of melts from 1100oC to room temperature. The samples were partially crystallised by heat treatment applied for 5 hours at 550oC followed by slowly cooling to room temperature. The electron paramagnetic resonance study carried out both on glass and vitroceramic samples points out important differences regarding the surrounding of the investigated S-state ions. Clustering tendency favouring the devitrification of the matrix is evidenced in all cases with the increase of MO content. The highest stabilising effect on the vitreous lead-bismuthate network is notified for gadolinium.  
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