In situ observation of the formation of Fe3O4 in Fe4N (001) due to electron irradiation

gamma(')-Fe4N was subjected to electron irradiation with the dose rate of 6.8 x 10(23)e m(-2) s(-1) in a 400 kV transmission electron microscope. The first in situ observation of the formation of Fe3O4 (O) on Fe4N (gamma(')) with the orientation relationship of [100](O) parallel [100](gamm...

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Bibliographic Details
Published in:Physical review letters 2003-06, Vol.90 (25 Pt 1), p.255504-255504
Main Authors: Liu, Z Q, Hashimoto, H, Sukedai, E, Song, M, Mitsuishi, K, Furuya, K
Format: Article
Language:English
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Summary:gamma(')-Fe4N was subjected to electron irradiation with the dose rate of 6.8 x 10(23)e m(-2) s(-1) in a 400 kV transmission electron microscope. The first in situ observation of the formation of Fe3O4 (O) on Fe4N (gamma(')) with the orientation relationship of [100](O) parallel [100](gamma(')) and (O) parallel (gamma(')) has been made inside the microscope with the basic column vacuum of (5-6) x 10(-5) Pa. A mechanism is proposed involving the electron-stimulated dissociation of Fe-N chemical bonds, desorption of nitrogen from the surface, adsorption of oxygen to the surface, and the oxidization of excessive metallic iron on the surface.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.90.255504