Author/Authors :
Maurizio، نويسنده , , C. Pailler-mattei، نويسنده , , G. and Canton، نويسنده , , P. and Cattaruzza، نويسنده , , E. and de Juliلn Fernلndez، نويسنده , , C. and Mazzoldi، نويسنده , , P. and DʹAcapito، نويسنده , , F. and Battaglin، نويسنده , , G. and Scian، نويسنده , , C. and Vomiero، نويسنده , , A.، نويسنده ,
Abstract :
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 °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 °C; nevertheless, the differences in the diffraction pattern recorded at T = 800 °C with respect to the corresponding one at room temperature suggest the presence of a second crystalline phase.
