The present study was undertaken for determination of microstructures of C60 phases, formed at different stages of high pressure and high temperature (HPHT) treatment by TEM methods. A sequence of fcc‐lattices was found after HPHT treatment at moderate temperature and pressure conditions. Increasing the pressure and temperature values further results in the formation of distorted fcc‐phases, explained by the formation of chains of bonded C60‐molecules. Curved carbon structures—ellipsoids and onions with compressed inner layers were observed in C60‐specimens after next stage of thermobaric treatment. Diffraction patterns of the structure, formed after higher parameters, show diffuse arc reflection, separated by a 70° angle. We can conclude, that the materials's hardness increases with increasing temperature and pressure. The hardest material has a structure consisting of onions and 70° disoriented fringes.
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Бланк et al. (2005) studied this question.
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