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A2: Medium temperature materials

Synthesis and Composition Optimization of p-type AgSnmSbTem+2 Thermoelectric Materials

Zhibo Xing, Zongyue Li, Qing Tan, Tianran Wei, Chaofeng Wu, and Jing-Feng Li
School of Materials Science and Engineering, Tsinghua University,Beijing

  Due to the worldwide energy shortage and environment problem, thermoelectric materials based on Pb-free compositions reattract much attention in recent years. In this study, AgSnmSbTem+2 compound thermoelectric materials were fabricated by a combined process of mechanical alloys and spark plasma sintering. Through tuning the composition and processing condition, thermoelectric performance of AgSnmSbTem+2 were adjusted. The electrical conductivity, Seebeck coefficient, and thermal conductivity were measured from 323 to 673 K. A thermoelectric figure of merit ZT≈0.7 is obtained at 673K for m=4, indicating that the AgSnmSbTem+2 system holds great promise as an alternative p-type, lead-free, thermoelectric material.