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    STUDIA PHYSICA - Issue no. Sp. Issue / 2003  
         
  Article:   THE FINE STRUCTURE OF THE EPR SPECTRA OF THE CHROMIUM IONS IN NON-CRYSTALLINE SOLIDS.

Authors:  LAVINIA COCIU.
 
       
         
  Abstract:  The features of the fine structure of the EPR spectra of the chromium ions in non-crystalline solids are discussed. The EPR spectra of Cr3+ ion in polycrystalline materials and the shift of the spectral features in terms of the E/D values are analysed. The computer simulation of some experimental EPR spectra of borate glasses reveals the presence of chromium in its tri- (d3) and penta- (d1) valence states ; the found Hamiltonian parameters of Cr3+ ions are g=1.98, D=0.216 cm-1 and E/D = 0.330. For Cr5+ ions, the symmetry of the -tensor changes from cubic (g=1.978) to axial (gx = gy = 1.98; gz = 1.93), when the Na2O content in glasses increases.  
         
     
         
         
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