New nanocarbons: rod milling and annealing of graphite in the presence of Yttrium

Publisher:
American Chemical Society
Publication Type:
Journal Article
Citation:
Energy & Fuels, 2004, 18 (6), pp. 1607 - 1614
Issue Date:
2004-01
Full metadata record
Files in This Item:
Filename Description Size
Thumbnail2004001082.pdf945.58 kB
Adobe PDF
This work investigate the mechanisns of ordering and disordering graphite in the presence of 1% and 10% yttrium through mechanical activation and subsequent thermal annealing at 1350 degrees C for 6h. Some work was done using other metals. Structural information was obtained by characterising the milled and annealed samples by laser Raman spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD) spectroscopy. In the initial stages (less than 72 h milling), yttrium assists in reducing the effects of rod milling on crystallite size but not later equilibration between broken and reformed cystallites. Examination by TEM of all annealed samples with iron, cobalt, yttrium or nickel revealed the formation of graphite, iron, cobalt ot nickel nanoparticles encapsulated wit carbon strips but not for yttrium. No evidence of carbon nanotubes was found under the milling conditions for periods of 0 - 240 h and annealing temperatures up to 1350 degrees C for 6 h.
Please use this identifier to cite or link to this item: