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Substructure of the metal nanomaterials after the intensive external influence
|Andrzej Misiuk 1, Rostyslav V. Shalayev 2, Boris M. Efros 2, Vladimir A. Ivchenko 3|
1. Institute of Electron Technology (ITE), al. Lotników 32/46, Warszawa 02-668, Poland
Nowadays, the problem of producing nanomaterials with 10-100 nm grain size is among the main actively developing scientific problems. It is already known that such materials possess unique physical and mechanical characteristics. In this respect, the reviewed paper aimed at the intensive external influence on sub-structure of nanometals is urgent.
The investigation objects were polycrystalline iridium, tungsten, nickel and copper metals of 99.95-99.99 % purity (with the initial grain size » 20-50 mm). The field ion microscopy which is practically the unique method providing the direct experimental observation of separate atoms constituting of sample, was taken as the basis one.
The object of investigation by field ion microscopy is various metals. In our experiments we took iridium, nickel, tungsten and copper pretreated with intensive external influence (ion implantation and severe plastic deformation).
Some interesting results have been obtained in this work. For example, it has been revealed that in nano-iridium influenced by severe plastic deformation a nanostructure is formed (the grain size of 20-30 nm), but in the bodies of grains there are practically no defects of structure, however, after implantation a sub-nano structure, (sub-grain size of 3-5 nm) is formed, and in the bodies of sub-grains there are defects.
The sub-nano structure in the surface and near-surface volumes of iridium was for the first time found as the resulting from the implantation of argon ions at distances, which are the order of magnitude larger than the projective path of argon ions from the irradiated surface.
The obtained results are enough new, they are important for doing investigations in the fields of nanotechnology and nanostructure materials science.
Presentation: Poster at E-MRS Fall Meeting 2007, Symposium J, by Rostyslav V. Shalayev
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-14 08:11 Revised: 2009-06-07 00:44