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Using crystallographic structures possessing unequivalent substitutional sites, it is shown that the basic criterion for the preferential location is determined by the bond length in the corresponding binary compounds, as they integrate both bond ionicity and the coordinance effects.

The study of the correlations between bonding parameters (ionicity, bond length) of a crystal and some spin-Hamiltonian parameters of a magnetic probe allows to demonstrate the occurrence of a lattice relaxation induced by the condition of a constant bond length between an identical pair of bonded ions, independently of the host matrix under consideration. L'etude des correlations entre les parametres de liaison (ionicite, distance interatomique) d'un cristal et certains parametres de l'hamiltonien de spin d'une sonde magnetique permet de demontrer l'existence d'une relaxation de reseau induite par la condition d'une distance constante entre une měme paire d'ions lies, independamment de la matrice consideree.