We have carried and low-temperature x-ray diffraction studies on C₆₀ fullerite polymerized by low quasi-hydrostatic pressure of 1.1 GPa at T = 563 K. It is established that at room temperature in freshly prepared samples three phases mainly coexist, viz. a compressed cubic phase with the lattice parameter a = 13,94 angstram, an orthorhombic O' phase with the lattice parameters a = 9,12 angstram, b = 9,82 angstram, c = 14,60 angstram, and a rhombohedral phase of symmetry R3m with the parameters a = 9,20 angstram and c = 24,27 angstram. Mechanical grinding or annealing at 573 K entails depolymerization of sintered samples and restoration of the fcc structure of pristine C₆₀. During annealing in air, intercalation of fullerite lattice by oxygen molecules occurs as well as a substantial amount of some new phase is formed,most probably with tetragonal symmetry,the chemical composition and structure of which have not been determined.The microhardness of polymerized C₆₀ is higher than that of single crystal samples roughly four-fold at room temperature and by a factor of 2,6 at liquid nitrogen temperature. Analysis shows that polymerization and grain boundaries give contributions to the microhardness of sintered samples but we did not succeed in separating these two contributions.

• Лубенець Серж Вікторович (фізико-математичні науки)
• Нацик Василь Дмитрович (1938–) (фізико-математичні науки)
• Стржемечний Михайло Олексійович (1940–) (фізико-математичні науки)
• Аксьонова Наталія Анатоліївна (1971–) (фізико-математичні науки)

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