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    STUDIA PHYSICA - Issue no. 2 / 2010  
         
  Article:   ESR AND RAMAN STUDY OF V2O5 – P2O5 – BI2O3 GLASS SYSTEM.

Authors:  N. VEDEANU, I. ARDELEAN. 		 
       
         
  Abstract:  xV2O5(1-x) [0,8 P2O50,2 Bi2O3] glass system, with 0 ≤ x ≤ 50% mol, was prepared and investigated by ESR and Raman methods. For low content of V2O5 all the ESR spectra present a hyperfine structure typical for isolated V4+ ions. With the increasing of V2O5 content, ESR absorption signal showing hyperfine structure is covered by a broad line without hyperfine structure characteristic for clustered ions. At high V2O5 content, the vanadium hyperfine structure disappears and only the broad line can be observed in the spectra.The changes observed in the Raman spectra at low concentracion of V2O5 content (x < 10 mol %) show that vanadium oxide acts as a network modifier of the glass matrix, the bands belonging to the phosphate groups being strongly reduced. At high content of vanadium (x > 20 mol %), the vibrations characteristic for V-O-P groups appear in the spectra and the V2O5 oxide acts as a network former.

Keywords: V2O5 – P2O5 – Bi2O3 glasses, ESR. 

 
         
     
         
         
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