Relying on the electron energy loss spectrum(EELS)of metallic elements to obtain microstructure analy-sis is an investigation method of the reaction mechanisms of transition metal oxides(TMOs)in catalysis,energy storage and conversion.However,the low signal from K shell owing to insufficient electron beam energy,and the complicated electronic structure in L shell of the metal element restrict the analysis of the coordination environment of the TMOs.Herein,density functional theory(DFT)calculation,Fourier transform(FT)and wavelet transform(WT)were employed to probe the relationship between the four individual peaks in O K-edge spectra of iron oxides and the microstructure information(chemical bonds and atomic coordination).The findings show that the peak amplitude ration is in a linear correlation with the valence state of Fe element,and that the coordination number obtained by radial distribution func-tion(RDF)is favorably linearly correlative with that from the standard coordination structure model.As a result,the quantitative analysis on the change of valence state and atomic coordination in microstructure can be realized by EELS O K-edge spectra.This study establishes EELS O K-edge spectrum as a promis-ing pathway to quantitatively analyze the valence state and atomic coordination information of TMOs,and offers an effective method to conduct microstructure analysis via the EELS spectra of the non-metal element.

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education,Jilin Normal University,Changchun 130103,China

[1]Junnan Chen;Yujie Qi;Ming Lu;Yiming Niu;Bingsen Zhang-.Identify fine microstructure of multifarious iron oxides via O K-edge EELS spectra)[J].中国化学快报（英文版）,2022(09):4375-4379

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