Superior performance and high service stability for Ge Te-based thermoelectric compounds

作     者：Tong Xing Qingfeng Song Pengfei Qiu Qihao Zhang Xugui Xia Jincheng Liao Ruiheng Liu Hui Huang Jiong Yang Shengqiang Bai Dudi Ren Xun Shi Lidong Chen 

作者机构：State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of Ceramics Chinese Academy of Sciences Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of Sciences Materials Genome InstituteShanghai University 

出 版 物：《National Science Review》 (国家科学评论(英文版))

年 卷 期：2019年第6卷第5期

页      面：944-954页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Key Research and Development Program of China(2018YFB0703600) the National Natural Science Foundation of China(51625205) the Key Research Program of the Chinese Academy of Sciences(KFZD-SW-421) the Program of Shanghai Subject Chief Scientist(16XD1403900) the Youth Innovation Promotion Association of the Chinese Academy of Sciences(2016232,P.Q.) 

主　　题：thermoelectrics phase transition thermal expansion service stability power generation application 

摘      要：GeTe-based compounds have been intensively studied recently due to their superior thermoelectric performance, but their real applications are still limited so far due to the drastic volume variation that occurs during the rhombohedral–cubic phase transition, which may break the material or the material/electrode interface during ***, superior performance and high service stability for GeTe-based thermoelectric compounds are achieved by co-doping Mg and Sb into *** linear coefficient of thermal expansion before phase transition is greatly improved to match that after phase transition, yielding smooth volume variation around the phase transition ***, co-doping(Mg, Sb) in GeTe successfully tunes the carrier concentration to the optimal range and effectively suppresses the lattice thermal conductivity.A peak z T of 1.84 at 800 K and an average z T of 1.2 in 300–800 K have been achieved in ***, a Ni/Ti/Ge0.85Mg0.05Sb0.1Te thermoelectric uni-leg is fabricated and tested, showing quite good service stability even after 450 thermal cycles between 473 K and 800 *** study will accelerate the application of GeTe-based compounds for power generation in the mid-temperature range.