Abstract
The emf (E) of Ag | AgI | Ag2GeS3 glass | D galvanic cells (where Ag and D are the electrodes of the cell, D is a three- or four-phase equilibrium alloy of the Ag-Pb-Se-Te system, and AgI | Ag2GeS3 glass is a bilayer membrane with purely ionic (Ag+) conductivity) was measured as a function of temperature in the range 520–575 K. The E(T) data were used to calculate the thermodynamic functions of saturated solid solutions in the PbSe-PbTe section of the Ag-Pb-Se-Te system. The observed breaks in the composition dependences of ΔfG2980, ΔfH2980, and TΔrS2980 and the change in the sign of TΔrS2980 in the range PbSe0.7Te0.3-PbSe0.73Te0.27 are interpreted as evidence for the formation of an intermediate berthollide phase.
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