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A Degeneracy Model of the Passive Layer on Iron

The spatial nonstoichiometry in the anodically grown passive layer on iron is considered as doping This results in a heavy doped three-layered PJN-junction structure of the passive film. The represented degeneracy model takes into account the possibility of degeneracy caused by voltage-induced band bending. Thus, Fermi statistics beside Boltzmann statistics are applied in evaluation the degeneracy influence on the capacitance-potential dependence. The essential feature of the model is the assumption that any deviation from exponential capacitance-potential behavior according to Boltzmann predictions is caused by the onset of degeneracy, necessitating the application of Fermi statistics.