Formation of a New Phase of C60under the Combined Action of High‐Pressure and X‐Ray Radiation

In a recent work by Meletov et al., the further high‐pressure photoinduced polymerization of the orthorhombic 1‐D phase of C60 was demonstrated using Raman scattering. The pressure of the transition is about 0.3 GPa at 300 K. In our present work, a similar process is now established using X‐ray irradiation as well as in‐situ high‐pressure X‐ray powder diffraction in a diamond anvil cell. The transformation to a new phase through the simultaneous action of pressure and X‐rays is observed between 0.2 and 1.66 GPa, in agreement with the aforementioned Raman results. A further increase in pressure leads gradually to the formation of a disordered phase.