Physics – Condensed Matter – Materials Science
Scientific paper
2002-06-13
Physics
Condensed Matter
Materials Science
8 pages, 3 figures. The manuscript is sent to journal 'Physics of the solid state'. The results will be submitted on inernatio
Scientific paper
10.1134/1.1575324
Within the framework of the virtual crystal method implemented in the shell model and pair potential approximation the crystal structure of mixed fluorites Ca(1-x)Sr(x)F(2) and Sr(1-x)Ba(x)F(2) has been calculated. The impurity center Eu(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 has been expressed using phenomenological dependence on distance E(2+)-F. The dependences of Stokes shift and Huang-Rhys factor on concentration x have been received for yellow luminescence in Sr(1-x)Ba(x)F(2):Eu(2+). The value x, for which the eg -level of Eu(2+) ion will be in conduction band in Sr(1-x)Ba(x)F(2):Eu(2+) has been calculated.
Chernyshev Andrey V.
Kotomanov S. V.
Nikiforov A. E.
Ougrumov Yu. M.
Zaharov Yu. A.
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