首页|The effect of C-60 fullerene polymerization processes on the mechanical properties of clusters forming ultrahard structures of 3D C-60 polymers
The effect of C-60 fullerene polymerization processes on the mechanical properties of clusters forming ultrahard structures of 3D C-60 polymers
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NSTL
Elsevier
We observed the effect of high (up to 80 GPa) pressure, catalyst (CS2) and laser irradiation on the process of three-dimensional (3D) polymerization of fullerene C-60 and the mechanical properties of the 3D C(60 )samples. The studies were carried out using resonant Raman spectroscopy and piezospectroscopy, high resolution transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy. We have revealed that the 3D C-60 structure consists of at least two types of clusters formed by covalent bonds with a different set of force constants, while C-60 molecules, as one of the elements of the 3D C-60 structure (clusters), are preserved at least up to a pressure of 80 GPa. The intensity of Raman scattering depends on the wavelength of the exciting radiation (resonance effect) and a set of force constants: the higher their values, the shorter-wavelength exiting radiation is required for Raman scattering observation by such clusters. Clusters with bulk moduli from 454 GPa to 644 GPa are formed depending on methods of C-60 polymerization. According to the set of clusters, 3D C-60 samples with bulk moduli from 506 GPa to 608 GPa were obtained.
NSTL
Elsevier
