Abstract
High-entropy ceramics were first proposed as multicomponent metal oxides in 2015 and have emerged as high-entropy materials. High-entropy ceramics comprise multicomponent ceramic compounds such as metallic oxides, nitrides, or carbides, whose large configurational entropies contribute to the formation of high-entropy ceramics. Despite the complex structure of ceramic compounds, high-entropy ceramics possess a homogeneous, crystalline, single-phase structure and offer chemical, physical, and mechanical properties that are superior to conventional ceramics. The extraordinary performance of high-entropy ceramics has been widely investigated and is proposed to be related to various phenomena, such as entropy-stabilized effect, element distribution, and crystal distortion. This chapter includes the general theory of high-entropy ceramics, typical synthesis methods, the properties and applications of various types of high-entropy ceramics, and empirical methods used in computational simulations to further demonstrate the methods for predicting and designing high-entropy ceramics.