Abstract
Nanocubes and partially truncated rhombic dodecahedral nanoparticles of Cr have been studied by electron diffraction, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. It is found that the nanoparticles of Cr are enclosed by the epitaxial passive oxide films. The oxide films on 100% truncated nanocubes of Cr with only one kind of facets, {1 0 0} facets, are face-centered cubic (fcc) structured Cr 2O 3 with a lattice constant of 0.407 nm. There are two kinds of oxide films in partially truncated nanoparticles of Cr with two kinds of crystallographic facets, {1 0 0} and {1 1 0}. The same fcc Cr 2O 3 is found on the {1 0 0} facets while the rhombohedral α-Cr 2O 3 is found on the {1 1 0} facets. This is similar to the two kinds of oxides, fcc and rhombohedral Fe 2O 3, which have also been observed in polyhedral nanoparticles of Fe. These passive Cr 2O 3, found in nanoparticles of Cr which have remained unchanged in water for four years, may have important implications for protective oxide films involving Cr.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
