Structure of iron oxide films prepared by evaporating various iron oxide powders
author:张玮光  Release time:2017-10-13   Browse times:13

Structure of iron oxide films prepared by evaporating various iron oxide powders

·C. Kaito,

·Y. Nakata,

·Y. Saito,

·K. Fujita

doi:10.1016/0378-5963(85)90194-1

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Abstract

Crystalline films composed of mixtures (1) Fe, Fe3O4 and FeO, (2) FeO and Fe3O4, and (3) Fe3O4 were obtained by evaporating FeO powder (1) in a vacuum of 10−5 Torr; (2) in an oxygen atmosphere of 10−4−10−3 Torr; and (3) in an oxygen atmosphere of 10−1 Torr, respectively. Films of γ-Fe2O3 were obtained by evaporating Fe3O4 powder in an oxygen atmosphere of 10−4 Torr, or by evaporating α-Fe2O3 powder in a vacuum of 10−5 Torr. The γ-Fe2O3 films gave only amorphous haloes in electron diffraction patterns. High resolution electron microscope images of the films showed crossed lattice fringes (whose spacings were assigned to the γ-Fe2O3 crystal) in areas 2 nm in extent. The formation of various iron oxide films is discussed in connection with experimental results from the oxidation of iron.

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