Polymorphism in Benzene, Naphthalene, and Anthracene at High Pressure

摘要: Optical observations, in which a microscope was used with the diamond-anvil pressure cell, were carried out on benzene, naphthalene, and anthracene up to temperatures of about 600 degrees C pressures approximately 40 kilobars. New high-pressure phases benzene (benzene III) (anthracene II) observed, existence polymorph, naphthalene II, verified. All three materials decompose initially reddish-orange liquid, ultimately amorphous carbon. The decomposition decrease increasing molecular size.