LOCAL-STRUCTURE OF DIVALENT SILVER COMPLEXES IN FLUORITE CRYSTALS AS SEEN BY EPR METHOD

The analytical expressions for spin-Hamiltonian parameters of Jahn-Tel ler paramagnetic centres [AgF2F6](6-) in fluorite crystals are deduced . Comparison with the experimental EPR data for CdF2, CaF2 and SrF2 yi elds information about the local structure of centres [AgF2F6](6-). It is found that two Ag2+-F- bonds of the centre (along the [111] direct ion) are shorter than the rest six bonds by factor 1.1. Euler angles o f six non-axial fluorines are almost the same as those in the undistor ted fluorite structure.