A Mössbauer study of Eu donor centers in PbS

The Mössbauer spectroscopy based on the 151Eu isotope is used to show that Eu centers, in the cation sublattice of PbS, play the role of an electrically active impurity: in the n-type samples, the spectra correspond to the neutral donor centers (Eu2+), whereas the spectra correspond to the ionized state of this center (Eu3+) in the p-type samples. For partially compensated material, the process of a fast electron transfer between the neutral and ionized centers is observed.

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