N-Type Mg_(3)Sb_(2-x)Bi_(x) Alloys as Promising Thermoelectric Materials

作     者：Hongjing Shang Zhongxin Liang Congcong Xu Jun Mao Hongwei Gu Fazhu Ding Zhifeng Ren 

作者机构：Department of Physics and Texas Center for Superconductivity at the University of Houston(TcSUH)University of HoustonHoustonTX 77204USA Key Laboratory of Applied Superconductivity and Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Research》 (研究（英文）)

年 卷 期：2020年第2020卷第1期

页      面：20-27页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Part of this work was supported by the National Natural Science Foundation of China(Grant No.U1832131 and Grant No.51721005) the Beijing Natural Science Foundation(Grant No.3202034) 

主　　题：alloying grain scattering 

摘      要：N-type Mg_(3)Sb_(2-x)Bi_(x) alloys have been extensively studied in recent years due to their significantly enhanced thermoelectric figure of merit(zT),thus promoting them as potential candidates for waste heat recovery and cooling *** this review,the effects resulting from alloying Mg_(3)Bi_(2) with Mg_(3)Sb_(2),including narrowed bandgap,decreased effective mass,and increased carrier mobility,are ***,defect-controlled electrical properties in n-type Mg_(3)Sb_(2-x)Bi_(x) are *** one hand,manipulation of intrinsic and extrinsic defects can achieve optimal carrier *** the other hand,Mg vacancies dominate carrier-scattering mechanisms(ionized impurity scattering and grain boundary scattering).Both aspects are discussed for Mg_(3)Sb_(2-x)Bi_(x) thermoelectric ***,we review the present status of,and future outlook for,these materials in power generation and cooling applications.