典型文献
Entropy-driven phase regulation of high-entropy transition metal oxide and its enhanced high-temperature microwave absorption by in-situ dual phases
文献摘要：
High-temperature microwave absorbers are significant for military equipment which experiences se-vere aerodynamic heat.In this work,high-entropy oxide(HEO)(FexCoNiCrMn)mOn with excellent high-temperature microwave absorption is studied.Driven by the effect of entropy,the composition of the oxide can be transformed from spinel-type phase(FexCoNiCrMn)3O4 to corundum-type phase(FexCoNiCrMn)2O3 with the increasing content of iron.Only spinel-type or corundum-type structure com-poses the oxide when x≤3 or x≥5.But in-situ dual phases can coexist when x equals 4 during phase transition.Interestingly,obliged to abundant heterogeneous interfaces and crystal defects in the dual-phase HEO,magnetic property,dielectric polarization,and microwave loss ability are all well en-hanced.The Smith chart analysis demonstrates the impedance matching condition is well improved due to the enhanced loss ability.These findings pave a new way for the adjustment of electromagnetic prop-erties of HEO by entropy-driven phase regulation.Meanwhile,the dual-phase absorber can achieve better than 90％absorption in 9.6-12.4 GHz at 800℃with a thickness of 2.6 mm,a low thermal diffusivity of 0.0038 cm2/s at 900℃,and excellent high-temperature stability,which indicates it's promising as a high-temperature microwave absorber.
文献关键词：
中图分类号：
作者姓名：
Guohao Dai;Ruixiang Deng;Xiao You;Tao Zhang;Yun Yu;Lixin Song
作者机构：
Key Laboratory of Inorganic Coating Materials CAS,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;State Key Laboratory of High Performance Ceramics&Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China
文献出处：
引用格式：
[1]Guohao Dai;Ruixiang Deng;Xiao You;Tao Zhang;Yun Yu;Lixin Song-.Entropy-driven phase regulation of high-entropy transition metal oxide and its enhanced high-temperature microwave absorption by in-situ dual phases)[J].材料科学技术（英文版）,2022(21):11-21
A类：
FexCoNiCrMn,mOn,obliged
B类：
Entropy,driven,regulation,high,entropy,transition,metal,oxide,its,enhanced,temperature,microwave,absorption,by,situ,dual,phases,High,absorbers,are,significant,military,equipment,which,experiences,vere,aerodynamic,heat,this,work,HEO,excellent,studied,Driven,effect,composition,transformed,from,spinel,type,3O4,corundum,2O3,increasing,content,iron,Only,structure,poses,when,But,coexist,equals,during,Interestingly,abundant,heterogeneous,interfaces,crystal,defects,property,dielectric,polarization,loss,all,well,Smith,chart,analysis,demonstrates,impedance,matching,condition,improved,due,These,findings,pave,new,way,adjustment,electromagnetic,erties,Meanwhile,achieve,better,than,GHz,thickness,low,thermal,diffusivity,stability,indicates,promising
AB值：
0.505448
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