High-resolution transmission electron microscopy study of epitaxial oxide shell on nanoparticles of iron

Y. S. Kwok*, X. X. Zhang, B. Qin, K. K. Fung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Remarkably oxidation-resistant nanoparticles of iron prepared at Tianjin University have been studied by electron diffraction and high-resolution transmission electron microscopy (HRTEM). HRTEM images clearly show the polyhedral epitaxy of γ-Fe2O3 layers on equivalent {100} facets of the {100} truncated {110} rhombic dodecahedral nanoparticles of iron. Oxide layers on {110} facets are formed by the lateral extension of the epitaxial {100} γ-Fe2O3 layers over adjacent {110} facets. The {110} oxide layers are bent and concave inward. The compressive γ-Fe2O3 layers which are about 4 nm thick give effective protection, according to the theory of Caberra-Mott, to the iron core from further oxidation.

Original languageEnglish (US)
Pages (from-to)3971-3973
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number24
StatePublished - Dec 11 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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