Article Synopsis
- The study investigates high-entropy materials and the conflicting roles of enthalpy and entropy on their structure and short-range ordering.
- Researchers synthesized 40 MAlC layered carbide phases with varying metal compositions and found that enthalpy-driven short-range ordering exists until entropy leads to complete disordering.
- The transformation of these phases into 2D sheets revealed how the balance of order and disorder influences their surface properties and electronic behavior.
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Article 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 MAlC 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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