Abstract
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.
基金项目
National Nat-ural Science Foundation of China(52102068)
Science and Technology on Advanced Functional Composite Laboratory(6142906200509)
Natural Science Foundation of Jiangsu Province(20KJB430017)
NUPTSF(NY219162)
NETL
NSTL
万方数据