High-entropy ceramics(HECs)show outstanding properties such as amorphous-like thermal conduc-tivities,colossal dielectric constant,superionic conductivity,enhanced electromagnetic wave absorption ability,super hardness and strength,which are promising for structural and functional applications.However,the high synthesis temperature has become the bottleneck that hinders the scale-up pro-duction and practical applications of HECs.It is thus appealing to develop a novel low-temperature process for the synthesis of HECs.To demonstrate the feasibility of low-temperature synthesis,herein,an electrospinning method has been utilized,for the first time,for the synthesis of high-entropy(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 nanofibers.It has been found that after electrospinning from liquid precur-sors single phase(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 solid solution with bixbyite structure can be formed by calcining at a temperature as low as 500℃,which is at least about 1000℃lower than that used in the solid-state synthesis method.The as-prepared(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 nanofibers are continuous and uniform with a smooth surface and a small diameter of 150 nm.It is also intriguing that the average grain size of(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 is only about 10 nm,which is much smaller than that in the solid-state synthesized powders.In addition,all the elements are homogeneously distributed along the nanofibers.This work demonstrates that high-entropy ceramic nanofibers can be synthesized from liquid precursors at low temperatures through a simple,efficient,and low-cost electrospinning method,which opens up a new avenue for the low-temperature synthesis of HECs.

New Energy Technology Engineering Lab of Jiangsu Province,School of Science,Nanjing University of Posts&Telecommunications(NUPT),Nanjing 210023,China

[1]Yan Xing;Wenqing Dan;Yicun Fan;Xing'ao Li-.Low temperature synthesis of high-entropy(Y0.2Yb0.2Sm0.2Eu0.2Er0.2)2O3 nanofibers by a novel electrospinning method)[J].材料科学技术（英文版）,2022(08):215-220

bixbyite

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