Abstract
Undoped and vanadium-doped lead telluride crystallic samples were studied by positron spectroscopy. It was shown that in undoped samples lead vacancies form large clusters at high temperatures and small clusters at low temperatures. In V-doped samples there are associates of 2 vacancies at all studied temperatures. Vacancy concentration is two orders lower than the concentration of vanadium atoms in PbTe(V) samples.
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