Electron Energy Loss Spectroscopy Analysis Method for Fine Structure Characterization of Transition Group Metal Oxides

Abstract

The invention discloses an electron energy loss spectroscopy analysis method for the microstructure characterization of transition metal oxides, belonging to the technical field of electron microscopy analysis. Firstly, the electron energy loss spectrum of oxygen in transition metal oxides was obtained by transmission electron microscopy, and then Gaussian function fitting was performed on the near-edge fine structure of the electron energy loss spectrum of oxygen to obtain the valence state information of metal elements in the material. Then, with the help of quintic spline function fitting, the oscillation signal in the extended fine structure of the electron energy loss spectrum of oxygen is extracted, and the oscillation signal is processed by coordinate transformation, noise removal and amplitude modulation. Then Fourier transform is performed on the processed oscillating signal to obtain the coordination structure information of the oxygen atom. Combining the valence state information of metal elements and the coordination structure information of oxygen atoms, complete quantitative information about the microstructure of transition metal oxides is finally obtained. This analytical method will facilitate the research of transition metal oxide materials in the fields of catalysis and energy storage.

Description

Electron Energy Loss Spectroscopy Credits for Fine Structure Characterization of Transition Metal Oxides Analysis method technical field The present invention relates to the technical field of electron microscopy analysis, be specifically related to a kind of fine Electron energy loss spectroscopy for structural characterization. Background technique Due to the advantages of various valence states and heterogeneous transitions, transition metal oxides are widely used as catalysts or electrode materials. received widespread attention. In order to explore the reaction kinetics of such materials in catalytic and electrode processes, it is necessary to study the transition metal Changes in the oxide microstructure were analyzed. In general, XRD and in situ XRD are used to obtain information on the crystallographic phase transition of materials. Using X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS), the characteristics of transition m...

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Problems solved by technology

However, due to the low K-shell signal and the complex electronic structure of the L-shell of metal elements in transition metal oxides, it is limited to obtain information on the coordination structure through the electron energy loss spectrum of metal elements.

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