Abstract
This paper presents the results of investigating the thermal destruction of fullerite and subsequent carbon ordering with the formation of graphite (graphitation) upon heating the samples to 1700°C. We study C60/70 fullerite powders with a predominant C60 content (C60—82.18%, C70—14.08%) obtained by the electric-arc evaporation of graphite rods with subsequent fullerene extraction from fullerene-containing soot by boiling toluene. Heating is performed in a CO environment. We investigate the changes in the fullerite crystal structure after thermal impact by means of X-ray diffraction, analyze the change in the spatial orientation in the carbon-carbon bonds by Raman spectroscopy, and estimated the particle dispersion by scanning electron microscopy. We show that the structural changes in the C60/70 fullerite upon heating above 950°C are caused by the destruction of its crystal structure with amorphous fullerite-like phase formation. Amorphization is accompanied by an increase in the dispersion of the carbon powders. Subsequent structural ordering is observed upon heating to temperatures above 1500°C and is accompanied by the formation of a graphite-like amorphous phase. Detailed analysis of the fullerite structure after its amorphization is performed on the samples annealed at 1600°C for 0.5–16 h. We find that after heating to 1600°C, the sample consists of, predominantly, turbostratic carbon; we also record α graphite and β graphite with the low degree of ordering. Ordering with graphite formation is shown to be accompanied by carbon-particle coarsening.
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The work is performed according to the research and design no. 121030100001-3 using equipment of the Center for Physical and Physical-Chemical Methods of Analysis, Research of the Properties and Characteristics of Surfaces, Nanostructures, Materials and Products, Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences.
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Nikonova, R.M., Larionova, N.S. & Lad’yanov, V.I. Peculiarities of the Structural Changes of C60/70 Fullerite upon Heating Temperatures up to 1700°C. J. Surf. Investig. 15 (Suppl 1), S120–S125 (2021). https://doi.org/10.1134/S1027451022020306
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DOI: https://doi.org/10.1134/S1027451022020306