Top-down method to fabricate TiNi_(1+x)Sn half-Heusler alloy with high thermoelectric performance  

作　　者：Xiong Yang Daquan Liu Jianbo Li Ruonan Min Huijun Kang Li Linwei Zongning Chen Enyu Guo Tongmin Wang 

机构地区：[1]Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China [2]School of Physics and Electronic Information,Hulunbeier University,Inner Mongolia 021008,China [3]Ningbo Institute of Dalian University of Technology,Ningbo 315000,China

出　　处：《Journal of Materials Science & Technology》2021年第28期39-45,共7页材料科学技术（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2017YFA0403803);the National Natural Science Foundation of China(Nos.51971052,51774065,51927801,and 51690163);the LiaoNing Revitalization Talents Program(No.XLYC1808005);the Innovation Foundation of Science and Technology of Dalian(Nos.2020JJ25CY002 and 2020JJ26GX045)。

摘　　要：The top-down method was used to fabricate the TiNi_(1+x)Sn half-Heusler alloy.Several knotty problems have been solved using the top-down method,including the generation of impurity phases,the visible discrepancy in the grain size of the TiNi_(2)Sn second phase,and irregular variations in the Seebeck coefficient(S),electrical conductivity(σ),and thermal conductivity(κ)with increasing Ni content.The generation of a large number of incoherent interfaces between the half-Heusler(HH)and full-Heusler(FH)phases fabricated by the top-down method drastically improved and retained κ and S,thereby leading to an enhancement in the dimensionless figure of merit(ZT)by~19%for the TiNi_(1.05)Sn sample as compared to the ZT of the samples prepared by the conventional method.

关 键 词：N-TYPE TiNi_(1+x)Sn Thermoelectric Thermal conductivity Incoherent interfaces Electrical conductivity 

分 类 号：TG132[一般工业技术—材料科学与工程]