ResultsComplete ScansThe Marathon green coke gave a peak at around 25.5° 2Q, apart from which no diffraction maxima were observed.All four calcined cokes gave well-defined graphite 0002 peaks at around 26° 2Q, indicating a decreasing in interlayer spacing over that in the green coke. In addition very broad diffraction maxima were observed at 2Q values of 43° and 53° in the needle cokes, with only the 43° peak discernable in the Collier and Marathon cokes.