The presence of multiple structural components in pyrolytic carbon at the deposition stage

The X-ray diffraction patterns of samples cut from different depths of a 2.54 cm thick plate of pyrolytic carbon showed that this material consists of structural components whose interlayer spacings d002 are 0.352, 0.345, 0.341, and 0.338 nm. During deposition thermally activated transformations between components occur sequentially from the 0.352 nm component down to the 0.338 nm component and it is suggested that these components are quasi-equilibrium phases.