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EPR investigation and thermal study of yA2O-(1-y)[0.25(WO3)2-0.75(P2O5)] (A=Li, Na) glasses

  • L. Bih
  • L. Abbas
  • M. Azrour
  • Y. El Amraoui
  • A. Nadiri
Article

Summary

Glasses belonging to the series yA2O-(1-y)[0.25(WO3)2-0.75P2O5] (y=0.10-0.60) are elaborated. DTA experiments reveal that the glass-network of the glasses are broken with increasing of modifier content. EPR spectra show the presence of two signals due to W5+ and Mo5+, as impuritie. The intensity of these EPR centres decreases when the concentration of A2O increases. The variation of Tg upon the modifier content is ascribed to structural changes occurring in the matrix of these glasses.

glass transition temperature EPR spectra phosphotungstate glasses 

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Copyright information

© Springer-Verlag/Akadémiai Kiadó 2005

Authors and Affiliations

  • L. Bih
    • 1
  • L. Abbas
    • 2
  • M. Azrour
    • 3
  • Y. El Amraoui
    • 4
  • A. Nadiri
    • 5
  1. 1.Laboratoire de Physico-Chimie des Matériaux
  2. 2.Laboratoire de Physico-Chimie des Matériaux
  3. 3.Laboratoire de Physico-Chimie des Matériaux
  4. 4.Laboratoire de Physique Statistique et Modélisation des Systémes
  5. 5.UFR, SMI, FS-Meknés

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