Fig. 9. (a) Crystal structures of different HEBs. Reproduced from Ref [167,170-172]. Copyright Elsevier 2021. (b) Prediction of multiple HEB2 syntheses by DEED: Compared with the results of EFA and VEC, the prediction of DEED was significantly better than the other two. Reproduced from Ref [10]. Copyright The Nature Publishing Group 2024. (c) Correlation between hardness, lattice distortion, and Atomic-size difference $\delta $ of HEB ceramics. Reproduced from Ref [164]. Copyright Elsevier 2023. (d) Oxidation depth of twelve samples oxidized at 1673 K for 2 h. Reproduced from Ref [145]. Copyright American Ceramic Society 2025. (e) HEB 2-Nd sample's oxide layer consists of a porous-dense-porous-dense four-layer structure; the oxide layer of the HEB2-Cr sample exhibits a distinct layer structure. Reproduced from Ref [166]. Copyright Elsevier 2025.
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