The structural evolution of cobalt nanoclusters synthesized in silica glass by ion implantation has been investigated upon thermal annealing. The samples were characterized by in-situ grazing incidence X-ray diffraction, exploiting a synchrotron radiation beam and following their evolution during thermal treatments in vacuo up to T=800 degrees C. Before heating, the system is composed of hcp Co nanocrystals; we have not detected the transition from hcp to fcc structure that in the bulk phase occurs around 420 degrees C; nevertheless, the differences in the diffraction pattern recorded at T=800 degrees C with respect to the corresponding one at room temperature suggest the presence of a second crystalline phase.
|Data di pubblicazione:||2007|
|Titolo:||Thermal evolution of cobalt nanocrystals embedded in silica|
|Rivista:||MATERIALS SCIENCE AND ENGINEERING. C, BIOMIMETIC MATERIALS, SENSORS AND SYSTEMS|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.msee.2006.06.001|
|Appare nelle tipologie:||2.1 Articolo su rivista |