Impedance of solid solutions based on gallium-doped lead telluride

The impedance of single-crystal PbTe:Ga and Pb0.94Ge0.06Te:Ga samples was studied in the frequency range from 102 to 106 Hz at temperatures of 4.2 to 300 K. It was shown that the effects associated with long-term relaxation processes do not result from a ferroelectric phase transition, because they are observed at much lower temperatures. The low-temperature features of the behavior of the capacitance in Pb0.94Ge0.06Te:Ga are regarded as a contribution from the impurity subsystem.