High-entropy oxides: Harnessing crystalline disorder for emergent functionality |
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| Authors: | George N. Kotsonis Saeed S. I. Almishal Francisco Marques dos Santos Vieira Vincent H. Crespi Ismaila Dabo Christina M. Rost Jon-Paul Maria |
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| Affiliation: | 1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, USA;2. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania, USA Department of Physics, The Pennsylvania State University, University Park, Pennsylvania, USA;3. Department of Physics and Astronomy, James Madison University, Harrisonburg, Virginia, USA |
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| Abstract: | High-entropy materials defy historical materials design paradigms by leveraging chemical disorder to kinetically stabilize novel crystalline solid solutions comprised of many end-members. Formulational diversity results in local crystal structures that are seldom found in conventional materials and can strongly influence macroscopic physical properties. Thermodynamically prescribed chemical flexibility provides a means to tune such properties. Additionally, kinetic metastability results in many possible atomic arrangements, including both solid-solution configurations and heterogeneous phase assemblies, depending on synthesis conditions. Local disorder induced by metastability, and extensive cation solubilities allowed by thermodynamics combine to give many high-entropy oxide systems utility as electrochemical, magnetic, thermal, dielectric, and optical materials. Though high-entropy materials research is maturing rapidly, much remains to be understood and many compositions still await discovery, exploration, and implementation. |
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| Keywords: | entropy functional properties high-entropy oxides synthesis |
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