ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)