Fullerite C 60 high-pressure phases. Raman study

Abstract

Fullerite C 60 high-pressure phases were studied using micro-Raman spectroscopy. High-pressure phases of C 60 fullerite have been obtained under hydrostatic conditions of 7.8 GPa at 1000–1600 °C. The new phase consists of strongly interacting agglomerates. Compared with pristine C 60, the spectra of the transformed material reveal irreversible changes depending on the treatment conditions. The Raman spectra of high-pressure phases exhibit some sp 3- as well as strong sp 2-hybridized carbon contributions. We discuss these results in terms of a slight shortening of distance between the C 60 molecules.