Atomic-resolution Interfacial Microstructure and Thermo-electro-magnetic Energy Conversion Performance of Gd/Bi0.5Sb1.5Te3 Composites

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Thermo-electro-magnetic materials with simultaneously large magnetocaloric(MC)and thermoelectric(TE)effects are the core part for designing TE/MC all-solid-state cooling devices.Compositing MC phase with TE material is an effective approach.However,the elemental diffusion and chemical reaction occurring at the two-phase interfaces could significantly impair the cooling performance.Herein,Gd/Bi0.5Sb1.5Te3(Gd/BST)composites were prepared by a low-temperature high-pressure spark plasma sintering method with an aim to control the extent of interfacial reaction.The reaction of Gd with the diffusive Te and the formation of GdTe nanocrystals were identified at the Gd/BST interfaces by the atomic-resolution microscope.The formed BiTe antisite defects and enhanced {000 I} preferential orientation in BST are responsible for the increased carrier concentration and mobility,which leads to optimized electrical properties.The heterogeneous interface phases,along with antisite defects,favor the phonon scattering enhancement and lattice thermal conductivity suppression.The optimized composite sintered at 693 K exhibited a maximum ZT of 1.27 at 300 K.Furthermore,the well-controlled interfacial reaction has a slight impact on the magnetic properties of Gd and a high magnetic entropy change is retained in the composites.This work provides a universal approach to fabricating thermo-electro-magnetic materials with excellent MC and TE properties.

外文关键词：

interfacial reactionmagnetocaloric performancethermoelectric performancethermo-electro-magnetic materials

作者：

Chengshan Liu、Wenjie Xu、Ping Wei、Shaoqiu Ke、Wenjun Cui、Longzhou Li、Dong Liang、Xianfeng Ye、Tiantian Chen、Xiaolei Nie、Wanting Zhu、Wenyu Zhao、Qingjie Zhang

展开 >

作者单位：

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Xianhu 528000,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

2019YFA07049031183401252130203921631229196320791963122

出版年：

2024

DOI：

10.1002/eem2.12710

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(4)