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Superparamagnetic behaviour of goethite prepared in sulphated medium (1990)

Olowe, A. A. ; Refait, Ph. ; Génin, J. M. R.

Springer

Hyperfine interactions 57 (1990), S. 2037-2043

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ISSN: 1572-9540

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The formation of goethite is simulated by stirring up in the presence of air a mixture of FeSO4, 7H2O and NaOH in the 1∶5 ratio at different initial concentrationC of ferrous ions. Mössbauer spectra of the oxidation end products display the sextet of goethite (αFeOOH) and a paramagnetic ferric doublet increasing whenC decreases; the crystal structure of goethite is also being modified. At a critical low concentration, the orthorhombic structure is no longer justified; inactive α′-FeOOH, which has a similar X-ray diffraction pattern as δ-FeOOH is obtained. All these compounds are crystallographically related.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02405761

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