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Interaction between α-, β or γ-FeOOH and water at 60 °C, 80 °C, and 100 °C

J. Petrovič, L. Števula, and M. Pisárčik

Institute of Inorganic Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, CS-842 36 Bratislava

 

Abstract: The influence of temperature (60 °C, 80 °C, and 100 °C) and time (4 weeks, 8 weeks, and 12 weeks) on phase composition and stability of polymorphous modifications of α-, ß-, and γ-FeOOH (goethite, akaganeite, and lepidocrocite) in aqueous suspension was investigated by X-ray phase analysis and infrared absorption spectral analysis. It has been found that ß- and γ-FeOOH is transformed to stable α-FeOOH or stable α - Fe203 (hematite) and, to a certain extent, to γy-Fe203 (maghemite). The degree of crystallinity increases. The presented infrared spectra of the starting materials as well as of the products of their heating (in the wavenumber range 250—4000 cm-1) indicate the transformation of hydroxyl water to surface-bonded water.

Full paper in Portable Document Format: 391a59.pdf

 

Chemical Papers 39 (1) 59–68 (1985)

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