Graphitizing at higher temperatures

Pure C02 is stable with respect to carbon deposition, as is pure H2, but there is a large composition range where mixtures of H2 and C02 will deposit graphite. Thus at lower temperatures the deposition curves intersect the ordinate at two points at higher temperatures, they retain their characteristic shape for some time, changing gradually to the almost straight line of the 2000°K curve. 

Partly disoriented layers of graphite were formed when each of these faces was dosed with sufficient benzene and annealed at temperatures between 375° and 425°C. At higher temperatures, the graphitic and other structures broke down and carbon diffused into the bulk of the metal crystal. 

Carefiil control of the reaction temperature at higher temperatures (627° 3°C) was necessary to reproducibly obtain a completely fluorinated pure white material. A snow-white material was obtained by direct fluorination of graphite at this temperature. Elemental analysis showed the calculated empirical formula to be CF112 003.20... 

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