Dimerisation and polymerisation of C70 after thermobaric treatment Original Research Article

Four crystalline phases have been identified by TEM-analysis of C70-samples after high-pressure-high-temperature (HPHT) treatment. All the phases are triclinic and exhibit distorted fcc lattices with a doubled c0-parameter. Decrease of lattice parameters and increased density are explained by a two-stage process: dimerisation at the first stage and the formation of chains consisted of C70-dimers at the second stage of thermobaric treatment.