We present new results that the states associated with Pb or Te vacancies in PbTe lie well up in the conduction band and that no localized states appear in the valence-conduction band gap. Holes and electrons due to Pb or Te vacancies cannot freeze out even at 0^∘{}K giving PbTe the character of a metal at very low temperatures.
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Parada et al. (1969) studied this question.
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