High-Entropy Oxides Based on Valence Combinations: Design and Practice

19 Pages Posted: 3 Aug 2020

See all articles by Lei Tang

Lei Tang

Schoolof Energy, Power and Mechanical Engineering,North China Electric Power University

Zemin Li

School of Energy, Power and Mechanical Engineering, North China Electric Power University

Kepi Chen

North China Electric Power University - School of Energy, Power and Mechanical Engineering

Cuiwei Li

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University; affiliation not provided to SSRN

Xiaowen Zhang

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University

Linan An

University of Central Florida - Department of Materials Science and Engineering

Abstract

High-entropy oxides (HEOs) are a new class of materials promising for a wide range of applications. Designing HEOs needs to consider both geometric compatibility and electrical equilibrium. However, there is currently no available method to systematically consider these two factors when selecting constituent materials for making HEOs. Here we propose a two-step strategy, where a HEO system is first partitioned into multiple subsystems based on the valence combinations of substituted cations; the geometric compatibility is then considered in selecting suitable substituted cations. We demonstrate this strategy by using A(5B0.2)O3 perovskite as a model system. We show that the system can be partitioned into 12 subsystems. Ten of the subsystems have formed a single-phase cubic perovskite, while two have partially ordering structure. The formation of the ordering structure is mainly correlated to cation-valence difference. We anticipate that this strategy is applicable to other systems.

Suggested Citation

Tang, Lei and Li, Zemin and Chen, Kepi and Li, Cuiwei and Li, Cuiwei and Zhang, Xiaowen and An, Linan, High-Entropy Oxides Based on Valence Combinations: Design and Practice. Available at SSRN: https://ssrn.com/abstract=3656143 or http://dx.doi.org/10.2139/ssrn.3656143

Lei Tang

Schoolof Energy, Power and Mechanical Engineering,North China Electric Power University

Zemin Li

School of Energy, Power and Mechanical Engineering, North China Electric Power University

Kepi Chen

North China Electric Power University - School of Energy, Power and Mechanical Engineering ( email )

Beijing, 102206
China

Cuiwei Li

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University

No Address Available

affiliation not provided to SSRN

No Address Available

Xiaowen Zhang

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University

Linan An (Contact Author)

University of Central Florida - Department of Materials Science and Engineering ( email )

Orlando, FL 32816
United States

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