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In-Situ Growth and Polygonization of Epitaxial Passive Oxide Films on Nanoparticles of Iron

Published online by Cambridge University Press:  02 July 2020

K.K. Fung ,
X.X. Zhang ,
Y.S. Kwok  and
Boxiong Qin
K.K. Fung
Affiliation:
Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China
X.X. Zhang
Affiliation:
Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China
Y.S. Kwok
Affiliation:
Department of Physics, Hong Kong University of Science and Technology, Hong Kong, China
Boxiong Qin
Affiliation:
Department of Mechanical Engineering, Tianjin University, Tianjin, China
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Abstract

Over the years, the study of the oxidation of nanoparticles of iron by transmission electron microscopy (TEM), Mossbauer spectroscopy and X-ray diffraction has established that nanoparticles of iron have a core-shell morphology in which the iron core is enclosed by shell of polycrystalline shell of ultrasmall γ-Fe2O3 and Fe3O4 crystallites. Recently, passivated nanoparticles of iron prepared by gas condensation of plasma evaporated vapor in Tianjin University exhibit remarkable resistance to further oxidation and corrosion in air and water. We have showed by TEM that these nanoparticles of iron are protected by a 4 nm epitaxial shell of γ-Fe2O3. The epitaxial orientation relationship, established by convergent beam electron diffraction from a nanoparticle, is as follows:

The [001] diffraction pattern of the oxide is rotated by 45° about a cubic axis relative to that of iron.

Type
Thin Films & Coatings
Information
Microscopy and Microanalysis , Volume 7 , Issue S2: Proceedings: Microscopy & Microanalysis 2001, Microscopy Society of America 59th Annual Meeting, Microbeam Analysis Society 35th Annual Meeting, Long Beach, California August 5-9, 2001 , August 2001 , pp. 1234 - 1235
Copyright
Copyright © Microscopy Society of America 2001

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References

References:

1.Kimoto, K. et al., Jpn. J. Appl. Phys. 2(1963)702.CrossRefGoogle Scholar
2.Hayashi, T. et al., Jpn. J. Appl. Phys. 16(1977)705.CrossRefGoogle Scholar
3.Haneda, K. and Morrish, A.H., Nature 282(1979)186.CrossRefGoogle Scholar
4.Linderoth, S., Morup, S. and Bentzon, M.D., J. Mater. Sci. 30(1995)3142.CrossRefGoogle Scholar
5.Hadjipanayis, G.C., Klabunde, K.J. and Sorensen, C.M., in Nanomaterials: Synthesis, Properties and Applications, Institute of Physics, Bristol (1996)385.Google Scholar
6.Qin, B. et al., J. Tianjin Univ. 29(1996)315.Google Scholar
7.Fung, K.K., Qin, B. and X.X. Zhang, , Mater. Sci. Eng. A286(2000)135.CrossRefGoogle Scholar
8.Kwok, Y.S. et al. Appl. Phys. Lett. 77(2000)3971.CrossRefGoogle Scholar