Significant influences of co-doping Ag and Sb on electrical properties and thermoelectric applications of AgPb_mSbTe_(m+2) compounds synthesized using solid state microwave technique

摘要

In this paper we reported the electrical conductivity and thermoelectric characterization of silver (Ag) and antimony (Sb) co-doped lead telluride bulk materials, which have been synthesized using solid state microwave technique. The doping level has performed first-principle calculations for the AgPb_mSbTe_(m+2) (LAST-m) (m = 0, 2, 4, 6, 8 and 10) to clarify the effect of simultaneous doping of Ag and Sb on PbTe. The Hall effect and thermoelectric measurements have shown n-type conductivity in AgPb_mSbTe_(m+2) samples. The samples show large and negative values of the Seebeck coefficient and moderate electrical conductivity. The Seebeck coefficient increased with doping levels increases at m=0 to 10. The value of the Seebeck coefficient is -419.69 μVK~(-1) for AgPb_8SbTe_(10) at 338 K. It has been found that AgPb_8SbTe_(10) sample has a higher thermoelectric power factor 1.87 mW K~(-2) m~(-1) at 310 K.