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- W2068448098 abstract "Abstract Electrochemically induced phase transformations of isolated rust layers have been investigated in situ by transmission Moβbauer spectroscopy. It has been found that oxidized rust films can be reduced in several stages. At potentials between −0.2 and −0.4 V(SHE) γ-FeOOH is partly reduced within the given crystal structure: Fe3+ ions are reduced to Fe21 and simultaneously O2 ions are protonized by diffusion of H+ into the lattice of γ-FeOOH. At potentials between −0.3 and −0.4 V the lattice of γ-FeOOH is transformed into the one of Fe3O4 and at potentials below −0.4 V α-FeOOH can also be reduced within the given crystal structure. After re-oxidation the reduced FeOOH phases are oxidized reversibly, whereas Fe3O4 can only be oxidized within the spinel structure to Fe3−δO4. Simultaneously to these redox reactions extremely small ( d A ) α-FeOOH crystals are transformed into larger crystals (Ostwald-ripening), and to a certain extent γ-FeOOH is transformed into the lattice of α-FeOOH. The importance of these phase transformations for understanding a number of corrosion processes is discussed." @default.
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- W2068448098 date "1989-01-01" @default.
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- W2068448098 title "In situ Möβbauer spectroscopic study of reactions within rust layers" @default.
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- W2068448098 doi "https://doi.org/10.1016/0010-938x(89)90123-6" @default.
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