Atomic‐resolution Interfacial Microstructure and Thermo‐electro‐magnetic Energy Conversion Performance of Gd/Bi0.5Sb1.5Te3 Composites
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Published:2024-01-22
Issue:
Volume:
Page:
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ISSN:2575-0356
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Container-title:ENERGY & ENVIRONMENTAL MATERIALS
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language:en
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Short-container-title:Energy & Environ Materials
Author:
Liu Chengshan1ORCID,
Xu Wenjie1,
Wei Ping12,
Ke Shaoqiu1,
Cui Wenjun1,
Li Longzhou1,
Liang Dong1,
Ye Xianfeng1,
Chen Tiantian1,
Nie Xiaolei1,
Zhu Wanting1,
Zhao Wenyu12ORCID,
Zhang Qingjie1
Affiliation:
1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China
2. Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu 528000 China
Abstract
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 antisite defects and enhanced {000 l} 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.
Funder
National Basic Research Program of China
Subject
Energy (miscellaneous),Waste Management and Disposal,Environmental Science (miscellaneous),Water Science and Technology,General Materials Science,Renewable Energy, Sustainability and the Environment
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