Transformation of solid C70 into nanotubes

Transformations of C70 fullerite materials under high pressure (up to 15 GPa) and temperature (up to 1720 K) influence are studied. The crystal structures of polymeric hard forms of C70 material have been studied by X‐ray powder diffraction. We have supposed new polymer phases of C70 during this treatment: precursor phase (under low pressure up to 9 GPa, temperature up to 600 K), chains (up to 12 GPa, 570K), phase of mixture of 3D polymerized C70 and nanotube fragments transformed from chains (high pressure up to 15 GPa, high temperature up to 1720 K).