The deformation of graphite crystals and the production of the rhombohedral form

This is the authors' abstract. We don't add key points for this paper.

Natural graphite single crystals and polycrystals have been deformed at room temperature and optical and electron microscope studies of these have been coupled with x-ray investigations. The appearance and disappearance of x-ray diffraction peaks corresponding to the rhombohedral structure has been investigated. After plastic shearing the graphite crystals contain many tilt and twist boundaries and are profusely twinned. A mechanism is proposed for the production of the rhombohedral form.