![]() One of the main factors responsible for stabilization of HECs is configurational (or mixing) entropy, which should be more than 1.5 R ( R is the universal gas constant), i.e., at least five principal elements in the composition 6, 7, 8. HECs are equimolar multi-component single-phase solid solution of 4–6 transition metals of IV and V groups occupying cubic NaCl-type crystalline lattice. Over the past few years, both theoretical and experimental development of refractory high-entropy materials has been actively pursued, including high-entropy carbides (HEC) 1, 2, 3, 4, 5. Ultra-High Temperature Ceramics (UHTC) are a class of refractory ceramics that are stable at high temperature, and they are usually made of carbides, borides, or nitrides of IV and V group transition metals. Our results demonstrate the conditions for the formation of HEC and we anticipate that our approach can pave the way towards targeted synthesis of multicomponent materials. Below 1200 K, the sample decomposed into (Ti-Nb-Ta)C, and a mixture of (Zr-Hf-Ta)C, (Zr-Nb-Hf)C, (Zr-Nb)C, and (Zr-Ta)C. ![]() In full agreement with the theory, the single-phase sample, produced with electric arc discharge, was observed at 2000 K. We used Canonical Monte Carlo (CMC) simulations with the machine learning interatomic potentials to determine the temperature conditions for the formation of single-phase and multi-phase samples. In this work, we developed an approach for a controllable synthesis of HEC TiZrNbHfTaC 5 based on theoretical and experimental techniques. ![]() ![]() Moreover, under some temperatures multi-phase structures can emerge. However, the formation temperature of a single-phase sample remains unknown. Synthesis of high-entropy carbides (HEC) requires high temperatures that can be provided by electric arc plasma method. ![]()
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