Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5458188 | Journal of Alloys and Compounds | 2017 | 20 Pages |
Abstract
AgPbmSbTem+2 (abbreviation as LAST) is a promising thermoelectric material based on PbTe for mid-temperature applications. The electrical and thermal transport properties of LAST alloys are greatly affected by the formation of nanostructured precipitation depending on the processing conditions, especially for spark plasma sintering (SPS) combined with mechanical alloying (MA). This study was focused on the optimization of SPS temperature (TSPS) and found that its variation in a narrow range (100 K) leads to apparent differences of thermoelectric performances. The sample sintered at an optimized temperature (TSPS = 923 K) shows a low κtotal (0.829 Wmâ1Kâ1) and a high PF (14.9 Wmâ1Kâ2), which is mainly attributed to the nanoscale composition segregation of Ag and Sb. The highest ZT value of 1.28 at 773 K was obtained when TSPS = 923 K, along with the highest ZTeng value of 0.26 and the corresponding ηmax value of 5.8% at the range of 323 K (Tcold)-773 K (Thot), which were increased almost twice by the optimization of sintering temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jun Pei, Bo-Ping Zhang, Jing-Feng Li, Dou-Dou Liang,