Abstract
We have prepared new nanocarbon phases using high‐temperature (1000–1600 K) treatment of C60 at moderate (0.1–1.5 GPa) pressures attainable for large‐volume high‐pressure apparatus. The structure of the phases has been studied by x‐ray diffraction and high resolution transmission electron microscopy (HRTEM). The Raman spectra and electron energy loss spectroscopy (EELS) provide evidence of the sp 2 bonding in the new materials. Mechanical and elastic properties are also presented. Whereas the values of density for the new nanocarbon phases are lower than that of graphite, they are still quite hard materials (H≈10–15 GPa) and have a high (∼90%) elastic recovery and record high values of the hardness‐to‐Young modulus ratio H/E≈0.17–0.22.
Published Version
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