CHEMICAL-SHIFTS AT K-ABSORPTION EDGES OF TRANSITION-METALS ADMIXED TOZNS AND ZNSE

This paper gives the experimental evidence of systematic X-ray K-absor ption edge studies in an effort to analyse the effect of cation chemic al shift in the group of compounds type Zn(1-x)M(x)A (M = Mn, Fe, Co, Ni; A = S, Se). The observed chemical shift was found practically inde pendent of the choice of anion, whereas it revealed a noticeable decre ase when passing from Mn to Zn. The effect was ascribed to the change of the 3d shell occupation. The calculations of the effective cation c harge (based on the theoretical approach of Kitamura and Chen, 1991) h ave shown that in the case of transition metals admired to ZnS and ZnS e there is a contribution of the 3d electrons to the overall charge tr ansfer, which indicates that the ability of 3d electrons to participat e in predominantly ionic bond decreases with 3d orbit filling.