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In this research, we investigated the carbon phase in the corncob charcoal powder by heating treatment at a temperature of 400 °C for 5 hours. The samples were analyzed by using X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR). To determine the degree of crystallinity and phase of the samples, the qualitative and quantitative data analyses were also performed. The results of data analysis indicated that the heating treatment was able to increase the crystallinity of the samples. The phase formation of the samples was the carbon graphite with 2H phase having a crystal system with R-3m space group. SEM data possessed the morphology of the samples, which still has lumps starting to form dimensions. Interestingly, the elemental analysis indicated the highest carbon element with the value of 67.99%. The molecular bonds in the charcoal include C-O and C=C positioned in a certain wave number.