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学者姓名：郑云鹏
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Abstract ：
The Ag-based superionic argyrodites with liquid-like ultralow lattice thermal conductivity have garnered widespread attention as promising thermoelectric materials. However, the inferior performance of n-type argyrodites does not match the p-type counterpart for device construction. Here, the two new cubic n-type Ag-based argyrodite compounds Ag4M0.5S2Te (M = Sn and Ge) are synthesized. They crystallize in the F (4) over bar 3m space group with excellent structural stability. The unique triangular [AgS2Te](5-), rod-like [AgSTe](3-), and complex cage-like [Te4Ag36](28+) clusters together with the vibrations of weakly bonded Ag+ ions result in large lattice anharmonicity and enhance the scatter of acoustic phonons. These structure characters lead to the ultralow lattice thermal conductivity (kappa(lat)) of 0.30-0.32 W m(-1) K-1 near the amorphous limit 0.24 W m(-1) K-1 at 525-823 K. Moreover, the power factor enhanced from 1.53 mu W cm(-1) K-2 for Ag4Sn0.5S2Te to 2.61 mu W cm(-1) K-2 by introducing Te deficiencies, resulting in a high ZT of 0.74 at 823 K for Ag4Sn0.5S2Te0.92, which is 95 % higher than that of the pristine sample.
Keyword ：
Ag4Sn0.5S2Te Ag4Sn0.5S2Te liquid-like argyrodites liquid-like argyrodites Te deficiencies Te deficiencies thermoelectric materials thermoelectric materials ultralow thermal conductivity ultralow thermal conductivity
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| GB/T 7714 | Yang, Ya , Yuan, Liling , Chen, Zixuan et al. The New Cubic Argyrodites: Ag4M0.5S2Te (M = Sn and Ge) with Ultralow Thermal Conductivity [J]. | ADVANCED FUNCTIONAL MATERIALS , 2025 . |
| MLA | Yang, Ya et al. "The New Cubic Argyrodites: Ag4M0.5S2Te (M = Sn and Ge) with Ultralow Thermal Conductivity" . | ADVANCED FUNCTIONAL MATERIALS (2025) . |
| APA | Yang, Ya , Yuan, Liling , Chen, Zixuan , Guo, Weiping , Zheng, Yunpeng , Ming, Hongwei et al. The New Cubic Argyrodites: Ag4M0.5S2Te (M = Sn and Ge) with Ultralow Thermal Conductivity . | ADVANCED FUNCTIONAL MATERIALS , 2025 . |
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Abstract ：
The unique structural features of high entropy oxides (HEOs) offer opportunities for flexible and precise structure control, thereby fostering a broad spectrum of structure-property tuning. This review surveys the extensive research carried out on HEOs, from initial exploration to recent advancement, summarizing progress in the refinement of synthesis techniques, elucidation of the high entropy effect, and understanding of atomic structures at multiple scales. Leveraging the impact of high entropy effect on structures, HEOs exhibit a wide range of properties from thermal to electrical, which have potential applications in fields such as thermoelectrics, dielectrics, energy storage, lithium batteries, catalysis, magnetism and supercapacitors. The correlations between structure and property are analyzed, and potential property-property relations are examined. Finally, we underscore the key challenges and unresolved questions that future research needs to address.
Keyword ：
Functional properties Functional properties High entropy oxides High entropy oxides Multicomponent equiatomic system Multicomponent equiatomic system
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| GB/T 7714 | Liu, Chang , Li, Shun , Zheng, Yunpeng et al. Advances in high entropy oxides: synthesis, structure, properties and beyond [J]. | PROGRESS IN MATERIALS SCIENCE , 2024 , 148 . |
| MLA | Liu, Chang et al. "Advances in high entropy oxides: synthesis, structure, properties and beyond" . | PROGRESS IN MATERIALS SCIENCE 148 (2024) . |
| APA | Liu, Chang , Li, Shun , Zheng, Yunpeng , Xu, Min , Su, Hongyang , Miao, Xiang et al. Advances in high entropy oxides: synthesis, structure, properties and beyond . | PROGRESS IN MATERIALS SCIENCE , 2024 , 148 . |
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Thermoelectrics converting heat and electricity directly attract broad attentions. To enhance the thermoelectric figure of merit, zT, one of the key points is to decouple the carrier-phonon transport. Here, we propose an entropy engineering strategy to realize the carrier-phonon decoupling in the typical SrTiO3-based perovskite thermoelectrics. By high-entropy design, the lattice thermal conductivity could be reduced nearly to the amorphous limit, 1.25 W m(-1) K-1. Simultaneously, entropy engineering can tune the Ti displacement, improving the weighted mobility to 65 cm(2) V-1 s(-1). Such carrier-phonon decoupling behaviors enable the greatly enhanced mu W/kappa L of similar to 5.2 x 10(3) cm(3) K J(-1) V-1. The measured maximum zT of 0.24 at 488 K and the estimated zT of similar to 0.8 at 1173 K in (Sr0.2Ba0.2Ca0.2Pb0.2La0.2)TiO3 film are among the best of n-type thermoelectric oxides. These results reveal that the entropy engineering may be a promising strategy to decouple the carrier-phonon transport and achieve higher zT in thermoelectrics.
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| GB/T 7714 | Zheng, Yunpeng , Zhang, Qinghua , Shi, Caijuan et al. Carrier-phonon decoupling in perovskite thermoelectrics via entropy engineering [J]. | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
| MLA | Zheng, Yunpeng et al. "Carrier-phonon decoupling in perovskite thermoelectrics via entropy engineering" . | NATURE COMMUNICATIONS 15 . 1 (2024) . |
| APA | Zheng, Yunpeng , Zhang, Qinghua , Shi, Caijuan , Zhou, Zhifang , Lu, Yang , Han, Jian et al. Carrier-phonon decoupling in perovskite thermoelectrics via entropy engineering . | NATURE COMMUNICATIONS , 2024 , 15 (1) . |
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