层状碳化物和二维碳化物中由熵引起的有序到无序转变

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-09-04 DOI:10.1126/science.adv4415

Brian C. Wyatt, Yinan Yang, Paweł P. Michałowski, Tetiana Parker, Yamilée Morency, Francesca Urban, Givi Kadagishvili, Manushree Tanwar, Sixbert P. Muhoza, Srinivasa Kartik Nemani, Annabelle Bedford, Hui Fang, Zachary D. Hood, Junwoo Jang, Krutarth Kamath, Bethany G. Wright, Rebecca Disko, Anupma Thakur, Sanguk Han, Neil Ghosh, Xianfan Xu, Zahra Fakhraai, Yury Gogotsi, Aleksandra Vojvodic, De-en Jiang, Babak Anasori

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引用次数: 0

摘要

在组成复杂的材料中，关于焓与熵对高熵材料的结构和短程有序的影响一直存在争议。为了帮助解决这一争议，我们合成并探测了40个含有2到9种金属的M4AlC3层状碳化物相，发现从焓开始的短程有序存在，直到熵增加到足以实现过渡金属在其原子平面上的完全无序。我们将所有这些层状碳化物相转化为二维（2D）薄片，并展示了有序与无序对其表面性能和电子行为的影响。这一研究表明，在多组分材料中，焓和熵之间的竞争对短程有序的关键作用。

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Order-to-disorder transition due to entropy in layered and 2D carbides

In compositionally complex materials, there is controversy on the effect of enthalpy versus entropy on the structure and short-range ordering in so-called high-entropy materials. To help address this controversy, we synthesized and probed 40 M₄AlC₃ layered carbide phases containing two to nine metals and found that short-range ordering from enthalpy was present until the entropy increased enough to achieve complete disordering of the transition metals in their atomic planes. We transformed all of these layered carbide phases into two-dimensional (2D) sheets and showed the effects of the order versus disorder on their surface properties and electronic behavior. This study suggests the key effect that the competition between enthalpy and entropy has on short-range order in multicompositional materials.

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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