Figure 7
The X-ray diffractograms of (a) graphite attached to rocks that were subjected to acid treatment (I) before heat treatment (II) after heat treatment and (III) comparison of (a-I) and (a-II) at 2θ vales around the peak position and (b) balled-milled graphite powder (I) before subsequent heat treatment (II) after subsequent heat treatment and (III) comparison of (b-I) and (b-II) at 2θ vales around the peak position.
