Understanding the role of entropy in high entropy oxides

Abstract

The field of high entropy oxides (HEOs) flips traditional materials science paradigms on their head by seeking to understand what properties arise in the presence of profound configurational disorder. This disorder, which originates from multiple elements sharing a single lattice site, can take on a kaleidoscopic character due to the vast numbers of possible elemental combinations. High configurational disorder appears to imbue some HEOs with functional properties that far surpass their non-disordered analogs. While experimental discoveries abound, efforts to characterize the true magnitude of the configurational entropy and understand its role in stabilizing new phases and generating superior functional properties have lagged behind. Understanding the role of configurational disorder in existing HEOs is the crucial link to unlocking the rational design of new HEOs with targeted properties. In this Perspective, we attempt to establish a framework for articulating and beginning to address these questions in pursuit of a deeper understanding of the true role of entropy in HEOs.

18 pages, 7 figures

References in corpus (6)

• Long range antiferromagnetic order in a rocksalt high entropy oxide
• What is in a Name: Defining -High Entropy- Oxides
• Entropy engineering and tunable magnetic order in the spinel high entropy oxide
• Impact of Stoichiometry of Yb2Ti2O7 on its Physical Properties
• Epitaxial stabilization of ultra thin films of high entropy perovskite
• LiNiO${}_2$ as a high-entropy charge- and bond-disproportionated glass

Cited by in corpus (13)

• High entropy ceramics for applications in extreme environments
• Photocatalytic Carbon Dioxide Methanation by High-Entropy Oxides: Significance of Work Function
• Impact of synthesis method on the structure and function of high entropy oxides
• Mixed atomic-scale electronic configuration as a strategy to avoid cocatalyst utilization in photocatalysis by high-entropy oxides
• Order evolution from a high-entropy matrix: understanding and predicting paths to low temperature equilibrium
• Short-range order and local distortions in entropy stabilized oxides
• Effect of high pressure synthesis conditions on the formation of high entropy oxides
• Expanding the search space of high entropy oxides and predicting synthesizability using machine learning interatomic potentials
• Extreme disorder in crystalline perovskite oxide: a new paradigm in quantum materials research
• Tailoring Robust Quantum Anomalous Hall Effect via Entropy-Engineering
• More is different: How chemical complexity influences stability in high entropy oxides
• High-Entropy Oxide Nanostructures for Rapid and Sustainable Nitrophenol Reduction
• Localization of vibrational modes in high-entropy oxides