Transport properties of AgPb16SbTe18 prepared by the inclusion of nano AgSbTe2 into PbTe matrix

Abstract

For the present investigation, AgPb16SbTe18 material was prepared by the inclusion of AgSbTe2 nanopowder into PbTe matrix, employing mechanical alloying route. This material was characterized for phase formation, microstructure, and transport properties. The microstructure showed densely populated grains with a grain size ~ 80 nm which plays an important role in controlling the transport properties. A remarkable enhancement in Seebeck coefficient (~ − 500 µV at 450 K) value of AgPb16SbTe18 sample was observed which is attributed to the phonon scattering and the potential barrier, encountered by the charge carriers at the nanostructured grain boundaries. The other important findings are enhancement in electrical conductivity and reduction in thermal conductivity which directly enhance the figure of merit of the material and make it promising for thermoelectric power generator application in the mid-temperature zone.