Abstract
Emission Mossbauer spectroscopy based on the isotope 119Sb(119mSn) is used to show that the location of antimony impurity atoms in the PbS lattice depends on the conductivity type of the material: in n-type samples the antimony is localized primarily on the anion sublattice, while in p-type material it is primarily on the cation sublattice. It is noteworthy that when the 119mSn center appears in the anion PbS sublattice (i.e., as an antisite defect) after radioactive conversion of 119Sb, its charge state does not depend on the position of the Fermi level. When the 119Sb-center is in the cation sublattice of PbS, it acts like an electrically active substitutional impurity: in n-type samples the spectrum corresponds to the neutral state of a donor center (119mSn2+), while in p-type material it corresponds to the doubly ionized state of this center (119mSn4+).
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