Abstract

Crystalline changes determined from the diffraction patterns of X-rays in C60 films were observed when magnesium atoms were incorporated into C60 films grown on mica substrates. The low full width at half maximum (FWHM) value for Mg-doped C60 on the mica substrate indicates the high crystalline quality at low magnesium concentrations. Infrared modes that were initially inactive became active owing to the interaction of magnesium atoms with the C60 molecule cage. The presence of the lines of triangular cyclic trimers suggests the presence of partially decomposed rhombohedral and rhombohedral polymers. Intermolecular bonds formed owing to the formation of polymeric phases in the film are responsible for the crystalline quality deterioration.

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