Control of interfacial reaction and defect formation in Gd/Bi2Te2.7Se0.3 composites with excellent thermoelectric and magnetocaloric properties

doi:10.1088/1674-1056/ad4cd3

中国物理B ›› 2024, Vol. 33 ›› Issue (8): 87403-087403.doi: 10.1088/1674-1056/ad4cd3

Control of interfacial reaction and defect formation in Gd/Bi₂Te_2.7Se_0.3 composites with excellent thermoelectric and magnetocaloric properties

Tianchang Xue(薛天畅), Ping Wei(魏平)†, Chengshan Liu(刘承姗), Longzhou Li(李龙舟), Wanting Zhu(朱婉婷), Xiaolei Nie(聂晓蕾), and Wenyu Zhao(赵文俞)‡

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

收稿日期:2024-02-03 修回日期:2024-04-09 出版日期:2024-08-15 发布日期:2024-07-15
通讯作者: Ping Wei, Wenyu Zhao E-mail:pingwei@whut.edu.cn;wyzhao@whut.edu.cn
基金资助:
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), and the Basic and Applied Basic Research Foundation of Guangdong Province (Grant No. 2022B1515120005).

Control of interfacial reaction and defect formation in Gd/Bi₂Te_2.7Se_0.3 composites with excellent thermoelectric and magnetocaloric properties

Tianchang Xue(薛天畅), Ping Wei(魏平)†, Chengshan Liu(刘承姗), Longzhou Li(李龙舟), Wanting Zhu(朱婉婷), Xiaolei Nie(聂晓蕾), and Wenyu Zhao(赵文俞)‡

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

Received:2024-02-03 Revised:2024-04-09 Online:2024-08-15 Published:2024-07-15
Contact: Ping Wei, Wenyu Zhao E-mail:pingwei@whut.edu.cn;wyzhao@whut.edu.cn
Supported by:
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), and the Basic and Applied Basic Research Foundation of Guangdong Province (Grant No. 2022B1515120005).

摘要/Abstract

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 GdTe, 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

Abstract: 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 GdTe, 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.

Key words: thermo-electro-magnetic energy conversion materials, interfacial reaction, thermoelectric performance, magnetic entropy change

中图分类号: (Thermoelectric effects)

74.25.fg

75.30.Sg (Magnetocaloric effect, magnetic cooling) 81.20.-n (Methods of materials synthesis and materials processing) 68.35.Ct (Interface structure and roughness)

Tianchang Xue(薛天畅), Ping Wei(魏平), Chengshan Liu(刘承姗), Longzhou Li(李龙舟), Wanting Zhu(朱婉婷), Xiaolei Nie(聂晓蕾), and Wenyu Zhao(赵文俞). Control of interfacial reaction and defect formation in Gd/Bi₂Te_2.7Se_0.3 composites with excellent thermoelectric and magnetocaloric properties[J]. 中国物理B, 2024, 33(8): 87403-087403.

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Control of interfacial reaction and defect formation in Gd/Bi₂Te_2.7Se_0.3 composites with excellent thermoelectric and magnetocaloric properties

Control of interfacial reaction and defect formation in Gd/Bi₂Te_2.7Se_0.3 composites with excellent thermoelectric and magnetocaloric properties

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