An electron paramagnetic resonance (EPR) experimental study of crystalline and powder p-Pb~_~_ySnyGdyTe samples for various matrix composition x and Gd content y has been carried out. The study reveals that grinding the crystals into powder as well as their low-temperature annealing turns Gd impurity ions from the EPR-silent Gd 2 § state to the EPR-active Gd 3 § state, whereas high -~ temperature annealing in vacuum quenches EPR signals from Gd 3 § ions. The experimental results are interpreted in terms of a model assuming that the trivalent charge state of the Gd impurity ions in lead and tin tellurides is a component part of the "substituting Gd impurity-Te vacancy" eomplex.
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