High-entropy ceramics: Present status, challenges, and a look forward

Huimin Xiang, Yan Xing, Fu zhi Dai, Hongjie Wang, Lei Su, Lei Miao, Guojun Zhang, Yiguang Wang, Xiwei Qi, Lei Yao, Hailong Wang, Biao Zhao, Jianqiang Li, Yanchun Zhou

Research output: Contribution to journalReview articlepeer-review

16 Citations (Scopus)

Abstract

High-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements. Although in the infant stage, the emerging of this new family of materials has brought new opportunities for material design and property tailoring. Distinct from metals, the diversity in crystal structure and electronic structure of ceramics provides huge space for properties tuning through band structure engineering and phonon engineering. Aside from strengthening, hardening, and low thermal conductivity that have already been found in high-entropy alloys, new properties like colossal dielectric constant, super ionic conductivity, severe anisotropic thermal expansion coefficient, strong electromagnetic wave absorption, etc., have been discovered in HECs. As a response to the rapid development in this nascent field, this article gives a comprehensive review on the structure features, theoretical methods for stability and property prediction, processing routes, novel properties, and prospective applications of HECs. The challenges on processing, characterization, and property predictions are also emphasized. Finally, future directions for new material exploration, novel processing, fundamental understanding, in-depth characterization, and database assessments are given.

Original languageEnglish
Pages (from-to)385-441
Number of pages57
JournalJournal of Advanced Ceramics
Volume10
Issue number3
DOIs
Publication statusPublished - 2021 Jun
Externally publishedYes

Keywords

  • applications
  • high-entropy ceramics (HECs)
  • processing
  • properties
  • structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites

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