Dedicated to Professor Hermann NEELS on the occasion of his 75th birthdayThe nonstoichiometry and point-defect structure of PbTe was investigated by various methods including carrier-concentration, lattice-constant, positron-annihilation and vapour-density measurements. The results are discussed in comparison with data published by other authors. New aspects are obtained especially from high-temperature experiments. A model of nonstoichiometry and defect structure in PbTe is proposed. The stability region of PbTe is essentially broader than reported until now. The disorder takes place mainly in the P b sublattice, i.e., there occur charged P b vacancies (Te-rich) and P b interstitials (Pb-rich), respectively, as well as probably additional neutral P b interstitials in Pb-rich PbTe.Die Nichtstochiometrie und Punktdefektstruktur von PbTe wurde mit verschiedenen Methoden untersucht, u. a. durch Messungen der Ladurigstragerkonzentration, der Gitterkonstante, der Positronenannihilation sowie der Dampfdichte. Die Ergebnisse werden mit denen anderer Autoren verglichen. Neue Aspekte ergeben sich insbesondere aus Hochtemperaturmessungen. Ein Model1 der Nichtstochiometrie und der Defektstruktur in PbTe wird vorgeschlagen. Das Stabilitiitsgebiet von PbTe ist wesentlich breiter als bisher berichtet. Die Fehlordnung tritt hauptsiichlich im Pb-Untergitter auf, d. h., es existieren geladene Pb-Leerstellen (Te-reich) bzw. Pb-Zwischengitterionen (Pb-reich) sowie zusiitzlich wahrscheinlich neutrale Pb-Zwischengitt,eratome in Pb-reichem PbTe.
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