High-entropy stoichiometric perovskite oxides based on valence combinations

• DOI: 10.1016/j.ceramint.2021.05.148
• Publication Date: 2021-05-26T06:55:10Z
• Authors: Jinxu Ma; Kepi Chen; Cuiwei Li; Xiaowen Zhang; Linan An
• Keywords: 0103 physical sciences; 01 natural sciences

Abstract The valence-combination strategy was applied to design B-site substitution non-equimolar stoichiometric high-entropy perovskite oxides (HEPOs). 29, 56 and 29 valence combinations with the maximum configurational entropy higher than 1.5R for five-component HEPOs were identified when the average valence of B-site is 3, 4 and 5, respectively. Synthesis experiment was performed on 8 valence combinations with the average valence of B-site equal to 4. Single-phase HEPOs were obtained from 6 of them. It was also found that most of HEPOs have ordered structures. The formation of single-phase HEPO and ordered structure was discussed in terms of structural tolerance factor and valence-difference factor.