The Structure and Refluorination of Residual Carbon Prepared by Thermal Decomposition of Graphite Fluoride

WATANABE Nobuatsu, CHONG Yong-bo, KOYAMA Satoshi

doi:10.1246/nikkashi.1981.228

Graphite fluoride (CF)n is decomposed to form perfluorocarbons and a kind of amorphous carbon which is usually called a residual carbon. When the residual carbon is fluorinated, (CF)n with a high crystallinity can be prepared even at low temperature as com pared with other carbon materialso. This paper describes the studies on the structure and physicochemical properties of the residual carbon by ' means of X-ray diffractometry, Raman spectroscopy, thermo-gravimetry and differential thermal analysis. In addition, the effect of its structure on the fluorination process is discussed.<BR>(1) The residual carbon is extremely amorphous as it has a very small Lc value. However, it has a three-dimensional structure partially. Most of carbon atoms in the residual carbon constitute the hexagonal network, though the stacking of network is random.<BR>(2) Fluorination of the residual carbon is of reaction-controlled eve n at temperature as low as 250°C. The graphite fluoride prepared from the residual carbon has a higher crystallinity than that from other amorphous carbons. Fluorination at temperatures higher than 300°C leads to a decrease in the yield of (CF)n because of the thermal decomposition of (CF)n formed. The thermal decomposition in the course of (CF)n formation can be depressed by gradual heating.<BR>(3) It is unnecessary to use highly oriented graphite in order to obtain (CF)n, with high crystallinity. Carbon with a large layer plane and random stacking of layers is suitable for the fluorination, yielding easily (CF)n with high crystallinity.

The Structure and Refluorination of Residual Carbon Prepared by Thermal Decomposition of Graphite Fluoride

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