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Thermoelectric Properties of Ag8Ge1-xMnxTe6 Solid Solutions
Ag8Ge1-xMnxTe6 solid solutions with different manganese content (x=0, 0.05, 0.1, 0.2) were prepared by alloying and further pressing the powders under a pressure of 0.6 GPa. By the X-ray diffraction studies have shown that the introduction of manganese atoms leads to the compressibility of the Ag8GeTe6 lattice. All p-type samples had high resistance below the transition at temperatures of 180-220 K. An increase in electrical conductivity in the range of 220-300 K was analyzed using the Mott ratio; at temperatures T>320 K, semiconductor behavior is observed in all compositions. The highest thermoelectric figure of merit ZT=0.7 at 550 K was obtained for a solid solution of the composition Ag8Ge1-xMnxTe6 (x=0.05). Keywords: solid solution, Ag8Ge1-xMnxTe6, thermoelectric efficiency, amorphization, low thermal conductivity
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