The Seebeck Coefficient and Electrical Resistivity of n-type PbTe between 20°C and 550°C†

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Abstract
A technique is described for measuring the Seebeck coefficient and electrical resistivity of small samples of thermoelectric materials over the temperature range 20°c to 550°c. The sample is encapsulated to minimize evaporation and a graphical method of presenting the measurements allows for thermocouple mis-match and enables errors in the temperature measurements, duo to poor thermal contact between the thermocouples and sample, to be assessed Results are given of measurements on a rouge of n-typo PbTe samples. The rapid rise of Seebeck coefficient and electrical resistivity with temperature at variance with conventional theory, is interpreted as being due to an increase of effective mass, m*, with temperature given by the approximate relation : At low doping levels comparison of results and theory suggests that there is appreciable impurity scattering.

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