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    STUDIA PHYSICA - Issue no. 1 / 2001  
         
  Article:   OPTICAL AND E.S.R. STUDY ON V2O5-MOO3 SOLID SOLUTION.

Authors:  GH. CRISTEA, L. STĂNESCU, I. ARDELEAN. 		 
       
         
  Abstract:  Our study on paramagnetic defects associated with the V4+ ions in the lattice of V2O5-5 mol% MoO3 solid solution is reported. The diffuse reflectance and ESR spectra on powder sample have been recorded at room temperature. It has been established that optical absorption beginning at 2.36 eV is due to charge transfer and not to band-band transition. Tetragonal (C4v) point symmetry of local crystal field at V4+ ion sits explains the experimental data. From optical transition energies of 16666 cm-1 and 15043.5 cm-1 the crystal field parameters have been determined. Taking the spin-orbit coupling constant of V4+ ion in the lattice  = 150 cm-1 the values of g and components has been evaluated and compared with those experimentally determine from ESR spectrum.  
         
     
         
         
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