
Micro-Structural Investigation of Graphite Powders 445
FIGURE 34 Slit-like pore development in NSG (8k x magnification)
When the particles edges are examined more closely in Figure 35, the low level of
crystalline perfection is further substantiated. The maximum, continuous edge widths
are no more than a few hundred nanometres, far less than the several micron observed
in the natural samples.
FIGURE 35 Degraded edge structure of NSG (50k x magnification)
The complex microstructural development characteristic of this sample is even
more pronounced in the pitch particles, as can be seen from Figure 36.