|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications IX
||Ni/Pb-Te and Ni/Se-Sn Interfacial Reactions and Their Related Phase Diagrams
||Yohanes Hutabalian, Zhi-kai Hu, Xu-hui Chen, Sinn-wen Chen
|On-Site Speaker (Planned)
PbTe-based and SnSe-based alloys are promising thermoelectric materials. Ni is frequently used as diffusion barrier. Interfacial reactions in Ni/PbTe, Ni/SnSe and Ni/SnSe2 couples are examined. Ni-Pb-Te and Ni-Se-Sn phase diagrams are assessed and used for the illustration of the interfacial reactions. The results indicate the reaction path is Ni/Ni3Te2/Ni5Pb2Te3/Liquid(Pb)/PbTe for the Ni/PbTe couples reacted at 650℃. Complicated reaction phenomena are observed. Three reaction zones are formed in the Ni/SnSe2 couples reacted at 500oC for 30 min. The three zones are clearly distinguishable, and all of them are not of single phase. Similar results are observed in the Ni/SnSe2 couples reacted at 300oC for 5 days. Thee reaction zones which are composed of multi-phases are formed. Since the average compositions of each of the three zones are along the mass balance line between Ni and SnSe2, it is very likely Ni penetrates into the SnSe2 substrate.