The Various Structures of Pyrolytic Graphite

Pyrolytic graphite is an aggregate of graphite crystallites which have dimensions (LJ that may reach several hundred nm (see Ch. 3, Sec. 2). It has aturbostratic structure, usually with many warped basal planes, lattice defects, and crystallite imperfections. 

Within the aggregate, the crystallites have various degrees of orientation. When they are essentially parallel to each other, the nature and the properties of the deposit closely match that of the ideal graphite crystal. 

The structure of a pyrolytic graphite deposit can be either columnar, laminar, or isotropic, depending on the deposition conditions such as temperature, pressure, and composition of the input gases.f Jf °lt JP0) jg possible to obtain the desired structure by the proper control of these deposition parameters. 

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