Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 44, Issue 2, Pages 585-594Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2023.09.056
Keywords
High entropy oxides; Configurational entropy; Phase stability; High entropy ceramics; Solid solution
Categories
Ask authors/readers for more resources
This article discusses the research and applications of high-entropy oxides, and analyzes the reasons behind their stability. The article points out that the effective role of entropy in stabilization should be demonstrated for each system, and provides a guide to discern between entropy-stabilized and non-entropy-stabilized oxides.
After the discovery of the prototypical high-entropy oxide with formula Cu0.2Zn0.2Mg0.2Co0.2Ni0.2O, the research on these materials has shown a dramatic boost. While many studies were devoted to exploring their possible applications, only few addressed the effective reasons behind their stability. The possibility to achieve a singlephase structure is usually hastily attributed to configurational entropy. This resulted in an extensive misuse of the terms entropy-stabilized oxides and high-entropy oxides, often employed as synonyms. However, the effective role of entropy in the stabilization should be demonstrated for each system, and even for Cu0.2Zn0.2Mg0.2Co0.2Ni0.2O it is still under debate. Moreover, many effects concur to the stabilization, i.e. the relative concentration, the valence state and the ionic radii of the cations involved. We will here discuss the role of configurational entropy in the phase stability, considering the main classes of crystal structures and providing a guide to critically discern between entropy and non-entropy stabilized oxides.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available