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Rational design and synthesis of Cr1-xTe/Ag2Te composites for solid-state thermoelectromagnetic cooling near room temperature |
| Xiaochen Sun(孙笑晨)1, Chenghao Xie(谢承昊)1, Sihan Chen(陈思汗)1, Jingwei Wan(万京伟)1,2, Gangjian Tan(谭刚健)1,†, and Xinfeng Tang(唐新峰)1,‡ |
1 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;
2 International School of Materials Science & Engineering, Wuhan University of Technology, Wuhan 430070, China |
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Abstract Materials with both large magnetocaloric response and high thermoelectric performance are of vital importance for all-solid-state thermoelectromagnetic cooling. These two properties, however, hardly coexist in single phase materials except previously reported hexagonal Cr$_{1-x}$Te half metal where a relatively high magnetic entropy change $(-\Delta S_{\rm M})$ of $\sim 2.4 $ J$\cdot $kg$^{-1}\cdot$K$^{-1}$ @ 5 T and a moderate thermoelectric figure of merit (ZT) of $\sim 1.2\times 10^{-2}$ @ 300 K are simultaneously recorded. Herein we aim to increase the thermoelectric performance of Cr$_{1-x}$Te by compositing with semiconducting Ag$_{2}$Te. It is discovered that the in-situ synthesis of Cr$_{1-x}$Te/Ag$_{2}$Te composites by reacting their constitute elements above melting temperatures is unsuccessful because of strong phase competition. Specifically, at elevated temperatures ($T > 800 $ K), Cr$_{1-x}$Te has a much lower deformation energy than Ag$_{2}$Te and tends to become more Cr-deficient by capturing Te from Ag$_{2}$Te. Therefore, Ag is insufficiently reacted and as a metal it deteriorates ZT. We then rationalize the synthesis of Cr$_{1-x}$Te/Ag$_{2}$Te composites by ex-situ mix of the pre-prepared Cr$_{1-x}$Te and Ag$_{2}$Te binary compounds followed by densification at a low sintering temperature of 573 K under a pressure of 3.5 GPa. We show that by compositing with 7 mol% Ag$_{2}$Te, the Seebeck coefficient of Cr$_{1-x}$Te is largely increased while the lattice thermal conductivity is considerably reduced, leading to 72% improvement of ZT. By comparison, $-\Delta S_{\rm M}$ is only slightly reduced by 10% in the composite. Our work demonstrates the potential of Cr$_{1-x}$Te/Ag$_{2}$Te composites for thermoelectromagnetic cooling.
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Received: 28 January 2024
Revised: 20 February 2024
Accepted manuscript online: 27 February 2024
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PACS:
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72.15.Jf
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(Thermoelectric and thermomagnetic effects)
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73.50.Lw
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(Thermoelectric effects)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2019YFA0704900) and the National Natural Science Foundation of China (Grant No. 52171221). |
Corresponding Authors:
Gangjian Tan, Xinfeng Tang
E-mail: gtan@whut.edu.cn;tangxf@whut.edu.cn
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Cite this article:
Xiaochen Sun(孙笑晨), Chenghao Xie(谢承昊), Sihan Chen(陈思汗), Jingwei Wan(万京伟), Gangjian Tan(谭刚健), and Xinfeng Tang(唐新峰) Rational design and synthesis of Cr1-xTe/Ag2Te composites for solid-state thermoelectromagnetic cooling near room temperature 2024 Chin. Phys. B 33 057201
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