nanostructures;
chemical synthesis;
crystal structure and symmetry;
X-ray scattering;
inelastic scattering;
D O I:
10.1016/j.jmmm.2003.08.003
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
The structural evolution of an Fe75Se25 powder mixture under ball milling was investigated as a function of milling time. It was followed using the X-ray diffraction (XRD), differential scanning calorimetry (DSC), Mossbauer spectroscopy (MS) and Raman spectroscopy techniques. From the XRD patterns, it was observed that the beta-FeSe and/ or Fe7Se8 phase is formed for milling times between 3 and 60 h and the balance of non-reacted alpha-Fe powder is reduced to nanometric scale. For longer milling times no other crystalline phases were observed. The Mossbauer measurements showed small amounts of iron oxide between 3 and 10 h of milling, which was not observed for milling times longer than 20h. The DSC and MS results indicate the existence of an amorphous-like FeSe alloy with low crystallization temperature. The Raman measurements showed the characteristic natural vibration modes of the N-FeSe and/or Fe7Se8 phase. (C) 2003 Elsevier B.V. All rights reserved.