The susceptibility of lead telluride PbTe

The results are given of measuring the temperature dependence of the susceptibility of samples of n- and p-type PbTe, containing either an excess of one or other of the components or ions Cl^–, or Ag⁺, as impurities. The conception of cation or anion vacancies, which can be occupied by a hole or electron, Ag⁺ or Cl^– ions, was employed, in addition to the constants taken from other measurements, to explain the dependences measured.