Atomic-resolution fine structure and chemical reaction mechanism of Gd/YbAl3 thermoelectric-magnetocaloric heterointerface

被引：4

作者：

Chen, Changkun ^{[1
]}

Sang, Xiahan ^{[1
,2
]}

Cui, Wenjun ^{[1
,2
]}

Xing, Lin ^{[1
]}

Nie, Xiaolei ^{[1
]}

Zhu, Wanting ^{[1
]}

Wei, Ping ^{[1
,2
]}

Hu, Zhi-Yi ^{[1
,2
]}

Zhang, Qingjie ^{[1
]}

Van Tendeloo, Gustaaf ^{[2
,3
]}

Zhao, Wenyu ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

[2] Wuhan Univ Technol, NRC Nanostruct Res Ctr, Wuhan 430070, Peoples R China

[3] Univ Antwerp, EMAT Electron Microscopy Mat Sci, B-2020 Antwerp, Belgium

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 831卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Gd/YbAl3; Thermoelectric-magnetocaloric heterointerface; Atomic-resolution fine structure; Solid-state refrigeration; INTERMETALLIC COMPOUNDS; MAGNETIC-PROPERTIES; YBAL3; COMPOUND; ALUMINUM;

D O I：

10.1016/j.jallcom.2020.154722

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thermoelectric materials and magnetocaloric materials are promising candidates for solid-state refrigeration applications. The combination of thermoelectric and magnetocaloric effects could potentially lead to more efficient refrigeration techniques. We designed and successfully synthesized Gd/YbAl3 composites using a YbAl3 matrix with good low-temperature thermoelectric performance and Gd microspheres with a high magnetocaloric performance, using a sintering condition of 750 degrees C and 50 MPa. Using aberration-corrected scanning transmission electron microscopy (STEM), it was discovered that the heterointerface between Gd and YbAl 3 is composed of five sequential interfacial layers: GdAl3, GdAl2, GdAl, Gd3Al2, and Gd3Al. The diffusion of Al atoms plays a crucial role in the formation of these interfacial layers, while Yb or Gd do not participate in the interlayer diffusion. This work provides the essential structural information for further optimizing and designing high-performance composites for thermoelectric-magnetocaloric hybrid refrigeration applications. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：8