Chemical and physical characterization of iron-intercalated vermiculite compounds |
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| Authors: | A Argüelles S A Khainakov J Rodríguez-Fernández M Leoni J A Blanco C Marcos |
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| Institution: | 1.Dpto. Física,Universidad de Oviedo,Oviedo,Spain;2.Dpto. Química Orgánica e Inorgánica,Universidad de Oviedo,Oviedo,Spain;3.CITIMAC; Facultad de Ciencias,Universidad de Cantabria,Santander,Spain;4.Department of Materials Engineering and Industrial Technologies,University of Trento,Trento,Italy;5.Dpto. Geología e Instituto de Organometálica Enrique Moles,Universidad de Oviedo,Oviedo,Spain |
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| Abstract: | Herein we report on synthetic iron-intercalated vermiculites prepared from a Mg-vermiculite mineral from Santa Olalla, Huelva, Spain, by means of an ion exchange process from aqueous solutions of FeCl2 and FeCl3. Thermogravimetric, X-ray diffraction, magnetic susceptibility and Mössbauer spectral studies have been used to characterize the synthetic iron-intercalated vermiculites. The results suggest that the intercalation process employed induces modifications in both the interlayer spacing and in the octahedral sheet; the disordered structure of the Mg-vermiculite mineral is not altered. The presence of solvated Fe(H2O) n 2+ ions has been shown by the Mössbauer spectroscopy. No magnetic order has been observed between 2 and 300 K neither in the Mg-vermiculite mineral nor in the two synthetic iron-intercalated vermiculites. |
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