Abstract
Thermal analysis was carried out in order to study the apparent oxidation and evaporation behavior of PbTe compounds (p-type: Pb0.5Sn0.5Te; n-type: PbTe + 0.5mass% PbI2). A fine powder (particle diameter below 25 micro m) of each of the PbTe compounds was investigated at temperatures ranging from room temperature to 773 K by using a DSC (differential scanning calorimeter) and TG-DTA (thermogravimetry/differential thermal analyzer). From the results of the heat capacity measurement, an exothermic reaction and an endothermic reaction were observed to occur at 593 K and 673 K, respectively, in Pb0.5Sn0.5Te. Exothermic and endothermic reactions were not evident in PbTe + 0.5mass% PbI2. From the results of the thermogravimetry, it was found that the weight of Pb0.5Sn0.5Te increased above 593 K and decreased above 673 K; on the other hand, the weight of PbTe + 0.5mass% PbI2 increased above 573 K and did not decrease. From these thermal analysis results, the oxidation and evaporation behavior of PbTe compounds was apparent.
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