Abstract
Single crystals of α-Al2O3 and LiNbO3 were implanted with57Co (dose: up to 2×1015 atoms/cm2) and with57Fe (dose: 2×1015 atoms/cm2) ions. The Mossbauer spectra revealed the disordered atomic environment. Fe2+ and Fe3+ charge states were observed. The spectra were compared to the spectra of crystals doped with57Co. It was remarkable that in the doped α-Al2O3 Fe3+ states with slow spin-spin relaxation have appeared. The CEMS study of the samples implanted with57Fe resulted in Fe2+ ionic states indicating that a fraction of Co atoms can also be in Co2+ state.
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