Читать книгу Industrial Carbon and Graphite Materials - Группа авторов - Страница 236

The structure of RHOMBOHEDRAL GRAPHITE can be best considered as an extended stacking fault in HEXAGONAL GRAPHITE. RHOMBOHEDRAL GRAPHITE cannot be isolated in pure form (NATURAL GRAPHITE and laboratory preparations contain less than 40% of RHOMBOHEDRAL GRAPHITE in combination with HEXAGONAL GRAPHITE). It is produced by shear deformation of HEXAGONAL GRAPHITE and transforms progressively to the hexagonal (ABAB) modification on heating above 1600 K.

See: HEXAGONAL GRAPHITE, NATURAL GRAPHITE.