Abstract
Using neutron diffraction and Raman spectroscopy, it was shown that the introduction of 7 at.% Al or Fe into crystalline fullerene C70 significantly increases its stability against transformation to disordered (amorphous-like) graphite when heated at temperatures of 500–1100 °C and a pressure of 2–8 GPa. In amorphous-like fullerene C70, this effect is absent. An explanation is proposed based on the known data on increasing stability of fullerene molecules when placing metal atoms inside or outside of the fullerene cage.
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