On the oxidation of CaF2 in transmission electron microscope |
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| Authors: | Nan Jiang |
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| Affiliation: | 1. Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, Shanghai 201800, China;2. University of Chinese Academy of Science, Beijing 100049, China;1. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia;2. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35,400-000, Brazil;3. Mining Engineering Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35,400-00, Brazil;1. Hubei Province Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center for Green Light-weight Materials and Processing, Hubei University of Technology, Wuhan 430068, PR China;2. School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, Hubei, PR China |
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| Abstract: | Electron stimulated oxidation of CaF2 in transmission electron microscope has been thoroughly studied using various electron microscopy techniques, including imaging, electron diffraction and electron energy-loss spectroscopy. It found that the electron irradiation induced CaO locate on the edge of specimen. The oxidation process is associated with desorption of F by electron irradiation, and originates from O impurities in the specimen. Driven by electric field produced by electron irradiation, the O ions inside bulk diffuse to the edge region, occupying the interstitials of metallized Ca lattice. Therefore, the accumulation of O along the edge of specimen results in forming CaO. |
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