In this work we present in situ investigations on the increase of the hcp-to-fcc transition temperature for Co with respect to the bulk value (420 °C) when nanoclusters are considered. Starting from Co:SiO2 composites obtained by ion implantation with average Co cluster size of about 5 nm, a transition temperature between 800 °C and 900 °C is found upon thermal annealing in vacuum by in situ transmission electron microscopy. Preliminary results on electron irradiation to promote the transition at lower temperatures are presented.
Autori: | |
Data di pubblicazione: | 2006 |
Titolo: | Size dependent hcp-to-fcc transition temperature in Co nanoclusters obtained by ion implantation in silica |
Rivista: | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.nimb.2006.04.111 |
Volume: | 250 |
Appare nelle tipologie: | 2.1 Articolo su rivista |
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