The high-purity and superfine high-entropy zirconate nanopowders, namely (Y0.25La0.25Sm0.25Eu0.25)2Zr2O7 nanopowders, without agglomeration, were successfully synthesized via polymerized complex method at low temperatures for the first time. The results showed that the crystallinity degree, lattice strain, and particle size of the as-synthesized powders were gradually enhanced with the increase of the synthesis temperature from 800 to 1300 ℃. The as-synthesized powders involved fluorite phase in the range of 800-1200 ℃ while they underwent the phase evolution from fluorite to pyrochlore at 1300 ℃. It is worth mentioning that the as-synthesized powders at 900 ℃ are of the highest quality among all the as-synthesized powders, which is due to the fact that they not only possess the particle size of 11 nm without agglomeration, but also show high purity and good compositional uniformity.
We acknowledge the financial support from the National Natural Science Foundation of China (Nos. 52122204 and 51972116), the Guangdong Basic and Applied Basic Research Foundation (Nos. 2019A1515012145 and 2021A1515010603), the Fundamental Research Foundation for the Central Universities (No. 2020ZYGXZR080), and the Creative Research Foundation of the Science and Technology on Thermostructural Composite Materials Laboratory (No. JCKYS2020607003).
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