High-entropy ceramics (HECs) have rapidly expanded from high-entropy oxides to high-entropy ultrahigh temperature ceramics/coatings and have drawn extensive attention in the field of ceramics. In addition, high-entropy thermoelectric materials focus on the topic of energy, which is another major driving force to accelerate the development of HECs. In this review, the recent progress on the design and synthesis of chemically complex ceramics is summarized. The fundamental understanding of configurational entropy, phase stability, and formation criterion of HECs are discussed. Critical comments on the compositionally complex ceramics and mixed-valence complex ceramics are presented. The synthesis methods of HECs are summarized, and reactive flash sintering is highlighted as a new strategy to synthesize HECs. The new design ideas and synthesis methods can provide more opportunities to develop high-performance HECs to meet the requirements of cutting-edge applications.

高熵陶瓷（HEC）已从高熵氧化物迅速发展为高熵超高温陶瓷/涂层，并在陶瓷领域引起了广泛关注。此外，高熵热电材料关注能源这一主题，这是加速HEC发展的另一主要动力。在这篇综述中，总结了化学复杂陶瓷设计和合成的最新进展。讨论了HEC的构型熵，相稳定性和形成标准的基本理解。提出了对成分复杂的陶瓷和混合价复杂的陶瓷的批评意见。总结了HEC的合成方法，并重点介绍了反应性闪速烧结作为合成HEC的新策略。