| 초록 |
AgPbBiS3 is a member of sulfosalt minerals. It appears to be promising for thermoelectric applications because of its, high symmetry of cubic structure, complex chemical composition and low electronic band gap. However, its pure synthesis and thermoelectric properties have not been well established. In this presentation, we discuss the synthesis of AgPbBiS3 by high-temperature solid-state reaction as well as its structural chemistry, spectroscopic analyses, and thermoelectric properties. AgPbBiS3 is a n-type semiconductor with a relatively low band gap at 0.74 eV. It crystallizes in the rock-salt type structure, where Ag, Pb, and Bi atoms are randomly distributed in the cation site and S atom is exclusively distributed at the anion site. Such a structural characteristic results in the low thermal conductivity of ~0.67W/mK and consequent a maximum thermoelectric figure of merit ZT of 0.36 at 828K for dense pellelts of AgPbBiS3 prepared by spark plasma sintering. |
