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Peculiarities of the Structural Changes of C60/70 Fullerite upon Heating Temperatures up to 1700°Cстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 мая 2022 г.
- Авторы: Nikonova R.M., Larionova N.S., Ladyanov V.I.
- Журнал: Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques
- Том: 15
- Год издания: 2021
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: S120
- Последняя страница: S125
- DOI: 10.1134/S1027451022020306
- Аннотация: This paper presents the results of investigating the thermal destruction of fullerite and subsequentcarbon ordering with the formation of graphite (graphitation) upon heating the samples to 1700°C. We studyC60/70 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 byboiling toluene. Heating is performed in a CO environment. We investigate the changes in the fullerite crystalstructure after thermal impact by means of X-ray diffraction, analyze the change in the spatial orientation inthe carbon-carbon bonds by Raman spectroscopy, and estimated the particle dispersion by scanning electronmicroscopy. We show that the structural changes in the C60/70 fullerite upon heating above 950°C are causedby the destruction of its crystal structure with amorphous fullerite-like phase formation. Amorphization isaccompanied by an increase in the dispersion of the carbon powders. Subsequent structural ordering isobserved upon heating to temperatures above 1500°C and is accompanied by the formation of a graphite-likeamorphous 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.
- Добавил в систему: Ларионова Настасья Сергеевна