Revealing the Chemical Instability of Mg3Sb2–xBix-Based Thermoelectric Materials

• DOI: 10.1021/acsami.3c12290
• Publication Date: 2023-10-20T20:27:10Z
• Authors: Xiaotong Wu; Xiaojing Ma; Honghao Yao; Kun Liang; Peng Zhao; Shuaihang Hou; Li Yin; Hengyu Yang; Jiehe Sui; Xi Lin; Feng Cao; Qian Zhang; Jun Mao

n-Type Mg3Sb2-xBix alloys have been regarded as promising thermoelectric materials due to their excellent performance and low cost. For practical applications, the is not only factor that should be taken into consideration. In addition, chemical thermal stabilities of material are equal importance for module design. Previous studies reported were unstable in an ambient environment. this work, we found reacted with H2O O2 at room temperature formed amorphous Mg(OH)2/MgO crystalline Bi/Sb. The substantial loss Mg resulted a significant deterioration properties, accompanied by transition from n-type p-type. With increase Bi content, stability decreased higher formation energy Mg3Bi2. A chemically stable Mg3Bi2 sample was achieved coating it polydimethylsiloxane isolate air.