The Thermoelectric Properties of AgSbTe2–AgBiTe2, AgSbTe2–PbTe and–SnTe Systems

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Abstract
Thermoelectric properties of AgSbTe2–AgBiTe2, AgSbTe2–PbTe and –SnTe systems are studied. In these alloys and also in AgSbTe2, when prepared by the usual method of zone melting, the thermoelectric power and the electrical conductivity vary along the length of the bar and the mode of the variation strongly depends on the speed of zone passing. These facts are probably related to the mode of precipitation of Ag2Te or Sb2Te3. The Hall mobility of AgSbTe2which does not contain the precipitates of Ag2Te has been found to change with the absolute temperature with an exponent of -0.7 and -1.3 for two specimens respectively. In AgSbTe2–AgBiTe2and–PbTe systems, the electrical conductivity decreases and the thermoelectric power increases with the increase of AgBiTe2or PbTE content. In AgSbTe2–SnTe system, the electrical conductivity increases and the thermoelectric power decreases with the increase of AgBiTe2content in AgSbTe2–AgBiTe2system while it has a broad minimum in the range of PbTe content from 20 to 60 atomic percent in AgSbTe2–PbTe system. In AgSbTe2–SnTe system, the lattice thermal conductivity increases with the increase of SnTe content.

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