Simulation of the Temperature Dependence of the Electrical Resistivity of Artificial Graphite Based on Isotropic Coke

Abstract—The results of a numerical calculation for the known experimentally determined temperature dependence of the electrical resistivity of artificial graphite based on isotropic coke, which was performed with consideration for the shape and electrical connection of lamellar crystals in a polycrystal, are reported. A chain model, in which graphite flakes were represented as unimodal lamellar crystals having electrical contacts with each other, was used for the calculations. According to this model, the streamlines run not only parallel but also perpendicular to the graphite plane. To estimate the microstructure parameters of the artificial graphite, we used the position of a minimum in the experimental temperature dependence of the electrical resistivity. Conversely, the influence of chain model parameters, including the anisometry and anisotropy of the conductivity of the flakes, the cross-section of contact spots, and their location on the surface of the flakes, on the calculated electrical resistivity of artificial graphite was estimated.