A Perspective on High‐Entropy Oxides as Potential Electromagnetic Wave Absorbers

Abstract The escalating impact of electromagnetic radiation on human health and electronic device stability has driven intensive research into advanced electromagnetic wave absorption (EMA) materials in recent decades. Among them, high‐entropy oxides (HEOs) have evolved into increasingly popular research in the material field since they were first reported in 2015. They are particularly promising for EMA applications due to their remarkable tunability and almost infinite compositional flexibility. The advantages of HEOs as EMA material from four key aspects are systematically clarified: the intrinsic properties of the high‐entropy system, crystal structure, compositional design, and synthesis strategies. A forward‐looking view on the future development of HEOs in EMA is highlighted, demonstrating six crucial points: dielectric genes, high‐throughput computational methods, material integration strategies, microstructural modulation, the high‐entropy concept expansion, and functional expansion. This perspective offers theoretical insights and technological references to advance high‐performance HEO research by systematically connecting the HEO family and EMA functionality.