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Within the framework of the virtual crystal method implemented in the shellmodel and pair potential approximation the crystal structure of mixed fluoritesCa(1-x)Sr(x)F(2) and Sr(1-x)Ba(x)F(2) has been calculated. The impurity centerEu(2+) and the distance Eu(2+)-F in this crystals have been also calculated.The low level position of excited 4f65d configuration of the Eu(2+) ion hasbeen expressed using phenomenological dependence on distance E(2+)-F. Thedependences of Stokes shift and Huang-Rhys factor on concentration x have beenreceived for yellow luminescence in Sr(1-x)Ba(x)F(2):Eu(2+). The value x, forwhich the eg -level of Eu(2+) ion will be in conduction band inSr(1-x)Ba(x)F(2):Eu(2+) has been calculated.Comment: 8 pages, 3 figures. The manuscript is sent to journal 'Physics of the  solid state'. The results will be submitted on inernational conference  SCINTMAT'2002 in oral session (june,20-22,2002,Ekaterinburg,Russia).  Corresponding author e-mail: vladimir.chernyshev@usu.r

The structure of mixed fluorides Ca1−x SrxF2 and Sr1−x BaxF2 and the luminescence of Eu2+ in these crystals