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

Kwok, Y. S.; Kwok, Y.S.; Zhang, X. X.; Zhang, X.X.; Qin, B.; Fung, K. K.; Fung, K.K.
December 2000
Applied Physics Letters;12/11/2000, Vol. 77 Issue 24
Academic Journal
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-Fe[sub 2]O[sub 3] 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-Fe[sub 2]O[sub 3] layers over adjacent {110} facets. The {110} oxide layers are bent and concave inward. The compressive γ-Fe[sub 2]O[sub 3] layers which are about 4 nm thick give effective protection, according to the theory of Caberra-Mott, to the iron core from further oxidation. © 2000 American Institute of Physics.


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