Abstract
Reduction of un-doped magnetite is developed topochemically with the formation of a dense iron shell. However, the reduction of alumina-doped magnetite to wüstite proceeds with the formation of a network-like structure which consists of criss-crossed horizontal and vertical plates of wüstite. Reduction of magnetite includes the conversion of Fe3+ to Fe2+ and the movement of iron cations from the tetrahedral sites on the {400} and {220} planes of magnetite to the octahedral sites on the {200} planes of wüstite. Alumina has a negligibly small solubility in wüstite. In the reduction of magnetite doped with Al2O3, rejected Al3+ cations from wüstite diffuse to the magnetite–hercynite solid solution. Enrichment of the Fe3O4–FeAl2O4 solution with alumina in the vicinity of the reduction interface restricts the growth of {220} planes of wüstite and nucleation of {220} planes adjusted to the existing planes, preventing the merging of wüstite plates during the reduction process. Reduction of magnetite from the magnetite–hercynite solid solution practically stops when the Al3+ content at the interface approaches the solubility limit. Wüstite in the separated plates is reduced further to iron.
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This project was financially supported by POSCO (South Korea) and Australian Research Council (ARC Linkage Project LP1200200634).
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Manuscript submitted September 5, 2016.
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Kapelyushin, Y., Sasaki, Y., Zhang, J. et al. Formation of a Network Structure in the Gaseous Reduction of Magnetite Doped with Alumina. Metall Mater Trans B 48, 889–899 (2017). https://doi.org/10.1007/s11663-016-0897-1
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DOI: https://doi.org/10.1007/s11663-016-0897-1