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Abstract
An anomalous spectral doublet attributed to Fe2+ impurity pairs is observed in Mössbauer absorption spectra of 57Fe0.01Zn0.99Se below room temperature. In Mössbauer emission experiments, ZnSe:57Co polycrystal and powder sources exhibit below 45K the nucleogenic Fe1+ valence state born as an after effect of the electron-capture decay of 57Co. Above 8K, the proportion of the nucleogenic Fe1+ decreases under the effect of the thermally activated Fe1+→Fe2+ relaxation. The activation energy is estimated to 0.004eV. While nucleogenic Fe1+ is absent in ZnSe:57Co single crystal spectra, increasing proportions are detected in samples with an enhanced specific surface. The formation model of the nucleogenic Fe1+ is extended to other zinc chalcogenides and a tentative model is developed, which shows the role of the surface electric field in limiting the formation of nucleogenic Fe1+ in well crystallised source samples.
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