Effects of Pb doping on the Thermoelectric Properties of Tl8.67PbxSb1.33-xTe6 Materials

TL;DR

This study investigates how lead doping influences the thermoelectric properties of Tl8.67PbxSb1.33-xTe6, revealing complex behaviors in Seebeck coefficient, electrical conductivity, and power factor across different lead concentrations and temperatures.

Contribution

It provides new insights into the effects of Pb doping on thermoelectric properties of Tl8.67PbxSb1.33-xTe6, including detailed analysis of Seebeck coefficient and power factor behaviors.

Findings

Seebeck coefficient increases with temperature from 295 to 550 K.

Pb doping causes complex variations in thermoelectric properties.

Power factor improves across the studied temperature range.

Abstract

We present the effects of lead doping on the thermoelectric properties of Tellurium Telluride, prepared by solid state reactions in an evacuated sealed silica tubes. Structurally, all these compounds were found to be phase pure as confirmed by the x-rays and energy dispersive spectroscopy analysis. The Seebeck co-efficient S was measured for all these compounds which show that S increases with increasing temperature from 295 to 550 K. The Seebeck coefficient is positive for the whole temperature range, showing p-type semiconductor characteristics. Complex behavior of Seebeck coefficient for lead doped compounds has been observed that at room temperature, the values of S for these compounds have complex behavior, first S decreasing with increase in lead concentration, and then S increases with increase in lead contents up to Similarly the electrical conductivity and the power factors have also complex behavior with lead concentrations. The power factor observed for these compounds are increases with increase in the whole temperature range studied here.