Control of interfacial reaction and defect formation in Gd/Bi_(2)Te_(2.7)Se_(0.3) composites with excellent thermoelectric and magnetocaloric properties  

作　　者：薛天畅 魏平 刘承姗 李龙舟 朱婉婷 聂晓蕾 赵文俞 Tianchang Xue;Ping Wei;Chengshan Liu;Longzhou Li;Wanting Zhu;Xiaolei Nie;Wenyu Zhao(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Chinese Physics B》2024年第8期474-481,共8页中国物理B（英文版）

基　　金：Project supported by the National Key Research and Development Program of China (Grant Nos.2019YFA0704900 and 2023YFB3809400);the National Natural Science Foundation of China (Grant Nos.52130203 and 52172232);the Basic and Applied Basic Research Foundation of Guangdong Province (Grant No.2022B1515120005)。

摘　　要：The method to combine thermoelectric(TE)and magnetocaloric(MC)cooling techniques lies in developing a new material that simultaneously possesses a large TE and good MC cooling performance.In this work,using n-type Bi_(2)Te_(2.7)Se_(0.3)(BTS)as the TE base material and Gd as the second-phase MC material,Gd/BTS composites were prepared by the spark plasma sintering method.In the composites,interfacial reaction between Gd and BTS was identified,resulting in the formation of Gd Te,which has a large impact on the electron concentration through the adjustment of defect concentration.The MC/TE composite containing 2.5 wt%Gd exhibited a ZT value of 0.6 at 300 K,essentially retaining the original TE performance,while all the composites largely maintained the excellent MC performance of Gd.This work provides a potential pathway to achieving high performance in MC/TE composites.

关 键 词：thermo-electro-magnetic energy conversion materials interfacial reaction thermoelectric performance magnetic entropy change 

分 类 号：O469[理学—凝聚态物理]