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Phase Boundary Mapping in ZrNiSn Half-Heusler for Enhanced Thermoelectric Performance

查看全文 作　　者：Xiaofang [1]Li;Pengbo [1]Yang;Yumei [2]Wang;Zongwei [1]Zhang;Dandan [3]Qin;Wenhua [2]Xue;Chen [1]Chen;Yifang [1]Huang;Xiaodong [1]Xie;Xinyu [1]Wang;Mujin [1]Yang;Cuiping [4]Wang;Feng [5]Cao;Jiehe [3]Sui;Xingjun [1,3]Liu;Qian [1]Zhang 高影响力作者 机构地区：[1]Department of Materials Science and Engineering,Institute of Materials Genome&Big Data,Harbin Institute of Technology,Shenzhen,Guangdong 518055,China;[2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;[3]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,Heilongjiang 150001,China;[4]Department of Materials Science and Engineering,Xiamen University,Xiamen,Fujian 361005,China;[5]Department of Science,Harbin Institute of Technology,Shenzhen,Guangdong 518055,China高影响力机构 出　　处：《Research》索引2020年第1期,共9页高影响力期刊 基　　金：This work was funded by the National Natural Science Foundation of China(51971081,11674078,and 51871081);the National Key Research&Development Program of China(2017YFA0303600);the National Natural Science Foundation of Guangdong Province of China(2018A0303130033);Shenzhen Fundamental Research Projects(JCYJ20170811155832192);Shenzhen Science and Technology Innovation Plan(KQISCX20180328165435202). 摘　　要：The solubility range of interstitial Ni in the ZrNi1+xSn half-Heusler phase is a controversial issue,but it has an impact on the thermoelectric properties.In this study,two isothermal section phase diagrams of the Zr-Ni-Sn ternary system at 973K and 1173 K were experimentally constructed based on the binary phase diagrams of Zr-Ni,Zr-Sn,and Ni-Sn.The thermodynamic equilibrium phases were obtained after a long time of heating treatment on the raw alloys prepared by levitation melting.Solubilities of x<0:07 at 973 K and x<0:13 at 1173 K were clearly indicated.An intermediate-Heusler phase with a partly filled Ni void was observed,which is believed to be beneficial to the lowered lattice thermal conductivity.The highest ZT value~0:71 at 973 K was obtained for ZrNi_(1.11)Sn_(1.04).The phase boundary mapping provides an important instruction for the further optimization of ZrNiSn-based materials and other systems. 关 键 词：ZrNi FILLED SOLUBILITY
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