Abstract
High entropy oxides (HEOs) are an emerging class of single-phase oxide solid solutions consisting of multiple cations in near-equiatomic proportions occupying a given cation sub-lattice. The vast composition space of HEOs offers a wide range of possibilities for tailoring properties, many of which are the result of their diverse cationic environment. This article provides an overview of the current state of research on HEOs, encompassing their classification based on configurational entropy, synthesis routes, important classes and compositions, phase stability mechanisms, and properties. Finally, the latest developments in high-throughput experimental techniques for accelerated composition screening of HEOs, which are inherently crucial for future HEO research, are presented.
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