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Investigation of Rust Formed on Steel Surfaces and Related Oxyhydroxides

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Abstract

In order to indentity the corrosion products formed on steel surfaces from 57Fe Mössbauer spectroscopy, detailed Mössbauer parameters have been determined for various kinds of iron-oxyhydroxides: α-FeOOH, β-FeOOH, γ-FeOOH and δ′-FeOOH. 57Fe Mössbauer measurements of the iron oxyhydroxides indicate the following results. Fe occupies a single site in α-FeOOH, but below the Néel temperature as at e.g., 300 K the Mössbauer spectrum is always broad, showing a distribution of the strength of the magnetic exchange interactions. Its shape depends on the grain-size and synthetic methods of the specimen. Fe occupies 3 sites in β-FeOOH. High-purity reagents of γ-FeOOH always contain small amounts of α-FeOOH and their Néel temperatures depend on the synthetic methods of the specimen. Mössbauer spectroscopy of the synthetic δ′-FeOOH shows very broad distribution of the hyperfine magnetic fields.

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Nasu, S., Kamimura, T. & Tazaki, T. Investigation of Rust Formed on Steel Surfaces and Related Oxyhydroxides. Hyperfine Interactions 139, 175–182 (2002). https://doi.org/10.1023/A:1021227223736

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  • DOI: https://doi.org/10.1023/A:1021227223736

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