For polyvinylchloride coke, three kinds of petroleum cokes having different needle-like nature, thermal black having the average diameter of about 3000 Å, and four kinds of chars made of polyaromatic compounds, the strain ε
c was measured from half widths of 002 and 004 diffraction lines and discussed in relation to c
o-spacing c
o.
The polyvinylchloride cokes heat-treated under different conditions, that is, under reduced pressure, under a high pressure of 1 kbar and in the flow of nitrogen, and three petroleum cokes showed the same relation betweenε
c and c
o, although the changes of c
o with heat treatment were very different. The thermal black and three polyaromatic compound chars had the different relation between ε
c and c
o from that for cokes. Non-graphitizing carbons were found to have larger value of ε
c, particularly for the c
o-spacing ranging from 6. 85 to 6.75 Å, than graphitizing carbons. In order to characterize the graphitization state, in other words, the structure, of the heat-treated carbons, not only c
o-spacing but also strain ε
c, for example, should be measured.
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