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Order-to-disorder transition due to entropy in layered and 2D carbides
Journal article   Peer reviewed

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

Brian C Wyatt, Yinan Yang, Paweł P Michałowski, Tetiana Parker, Yamilée Morency, Francesca Urban, Givi Kadagishvili, Manushree Tanwar, Sixbert P Muhoza, Srinivasa Kartik Nemani, …
Science (American Association for the Advancement of Science), v 389(6764), pp 1054-1058
04 Sep 2025
PMID: 40906844

Abstract

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 M AlC 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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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Materials Science, Multidisciplinary
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