New results about the II-III phase transition in hexamethylbenzene have been obtained, which show large hysteresis. From the adiabatic calorimetry in the cooling direction, combined with those in the heating direction, the true transition point was determined to be 115.5±0.3 K with the entropy of transition, 9.55±0.08 J·K−1·mol−1. Under certain conditions, the anomalous heat capacity curve can be made to consist of two separate peaks. It is a manifestation of “memory effect” of the first-order transition.
Pyrolytic carbon films were deposited on nickel sheets by pyrolysis of benzene at 1000°C. The surface morphology and the degree of graphitization of the deposited carbon films depended on the benzen concentration of the supplied gas. A large amount of nickel was extruded from the nickel substrate to the surface of the carbon film at a certain concentration of benzene.
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