ISSN:
1434-6036
Schlagwort(e):
PACS. 61.48.+c Fullerenes and fullerene-related materials – 81.05.Tp Fullerenes and related materials – 61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling – 81.07.Bc Nanocrystalline materials – 81.15.Fg Laser deposition
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract: Evidence is presented for the formation of a solid phase based on the smallest fullerene, C20, in thin diamond-like carbon films deposited by ultraviolet laser ablation from diamond onto nickel substrates at room temperature in the presence of 10-4 torr of cyclohexane or benzene. Laser desorption mass spectrometry from the films shows the presence of C20, C21 and C22 species, while micro-Raman spectroscopy and electron diffraction from selected particles together with first principle density-functional calculations, indicate a cubic solid with dodecahedral C20 cages as building blocks. Unlike solid C60 and fully protonated C20, which are bound by van der Waals forces, the proposed structure is stabilized by linking of the C20 dodecahedra with bridging carbon atoms at interstitial tetrahedral sites to form a face-centered-cubic lattice with 22 carbon atoms per unit cell.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1140/epjb/e2003-00060-4
