NEW STRUCTURE AFTER THERMOBARIC TREATMENT OF SOLID C-60

The hard phase in the C-60-samples obtained after heating to 670-770 K under high pressure 9.5 GPa was examined by transmission electron mic roscopy. We have found that the samples exhibit an unusual structure. Diffraction patterns from this structure show the diffuse are reflecti ons as well as disordered carbon structures, but with a regular arrang ement in reciprocal space. The diffraction pattern remains through lar ge regions of the samples, and the connection of the twin type is obse rved for the platelet structure in the samples. Possible variants of t he new structure are considered.