Abstract
Changes in the structure of two graphitizable carbons and four non-graphitizable carbons were followed by measuring d(002), d(110), L c (002), and L a (110) as a function of HTT. It is observed that graphitizable carbons undergo rapid changes in the structure in the temperature range 2400–3000°C and become polycrystalline graphite. Non-graphitizable carbons change slowly and their (002) reflexions exhibit certain features. With heat treatment the (002) reflexions sharpen and their peak position shifts to higher angles. Two well-defined peaks, at 2 θ = 26° and 26°, develop when L c reaches a value 20–40 Å. It appears that beyond that stage the profile may be resolved into a broad peak at 2 θ = 26° and two sharp peaks at 26° and 26°, the sharp peaks indicating L c values of several hundred Å. With increased heat treatment to 3000°C, the peak at 26° gradually becomes more prominent at the expense of the other. A correlation is found to exist between d(002) and L c or L a .
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