Facile synthesis of high-entropy zirconate nanopowders and their sintering behaviors  

作　　者：Lin Tan Xinghua Su Jingxin Yang Pengchao Ji Fu Sun Qiang Tian Zhenhuan Zhao 

机构地区：[1]School of Materials Science and Engineering,Chang’an University,Xi’an 710061,China [2]State Key Laboratory of Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China [3]School of Advanced Materials and Nanotechnology,Xidian University,Xi’an 710126,China

出　　处：《Journal of Advanced Ceramics》2023年第3期498-509,共12页先进陶瓷（英文）

基　　金：supported by the Key Research and Development Projects of Shaanxi Province(Grant No.2021GY-250);the Open Project of State Key Laboratory of Environment-Friendly Energy Materials(Grant No.20kfhg06);the Fundamental Research Funds for the Central Universities of China(Grant No.300102312406).

摘　　要：The challenge in synthesizing high-entropy ceramic(HEC)nanopowders is to suppress severe grain coarsening and particle agglomeration,which occur at elevated temperatures.This challenge could be addressed by the polyacrylamide gel method.In this work,single-phase high-entropy(Lao.2Ndo.2Smo.2Gdo.2 Ybo.2)2Zr2O7 and(Lao.2Ndo.2Yo.2Euo.2Gdo.2)2Zr2O7 nanopowders without agglomeration were successfully synthesized using the polyacrylamide gel method for the first time.The results showed that phase composition,particle size,and agglomeration degree of the nanopowders were greatly influenced by the molar ratio of acrylamide(AM)/Zr and calcination temperature.These as-synthesized high-entropy zirconate(HEZ)nanopowders could be sintered into fully dense ceramics at 1500 C for 2 h.These HEZ nanopowders showed a phase transformation from a defect-fluorite phase to a pyrochlore phase with the increase of sintering temperature.Additionally,two-step sintering of these nanopowders was conducted,and the HEZ ceramics with fine grains were prepared.The polyacrylamide gel method is simple and easily operated,which is a facile approach of producing the HEC nanopowders with excellent sinterability.

关 键 词：high-entropy ceramics(HECs) NANOPOWDERS ZIRCONATE acrylamide(AM) sintering 

分 类 号：TB383.3[一般工业技术—材料科学与工程]