Abstract
High-entropy oxides (HEOs), due to their excellent physicochemical properties, have attracted extensive attention. In this work, the solution combustion synthesis approach was applied to prepare a series of porous single-phase HEO nanocrystalline powders. Equiatomic (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O, (Cr0.2Fe0.2Mn0.2Mg0.2Zn0.2)3O4 and (Ce0.2La0.2Pr0.2Sm0.2Y0.2)O2 were successfully obtained. While the former two could be stabilized into single rock-salt (Fm-3m) and spinel (Fd-3m) structures, the latter could be synthesized to have either CaF2-type (Fm-3m) or CaF2-related-type (Ia-3) structure depending on synthesis temperature. Furthermore, their chemical and microstructural homogeneity was further confirmed.
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