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The passive film on Fe–Cr binary alloys has been modeled using a network in which ions occupy sites on a honeycomb lattice and ions form a Kagomé lattice. Percolation theory is used to determine the critical composition of the oxide film where bonds percolate across the oxide film. The calculated result of 0.34 cation fraction in the oxide film is in excellent agreement with the result obtained previously using graph theory.
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E. McCafferty (2008) studied this question.
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