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Clays and Clay Minerals; August 2009; v. 57; no. 4; p. 433-443; DOI: 10.1346/CCMN.2009.0570404
© 2009 Clay Minerals Society
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Right arrow Articles by Bachir, C.
Right arrow Articles by Weidler, P. G.

MAGNETIC TITANIUM-PILLARED CLAYS (Ti-M-PILC): MAGNETIC STUDIES AND MÖSSBAUER SPECTROSCOPY

Cherifa Bachir1,2,*, Yanhua Lan3, Valeriu Mereacre3, Annie K. Powell3, Christian Bender Koch4 and Peter G. Weidler1,*

1 Institute of Functional Interfaces, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
2 Department of Industrial Chemistry, Faculty of Sciences, B.P. 1505 EL-Mnaouer, University of Sciences and Technologies USTO ‘Mohamed Boudiaf’, Oran, Algeria
3 Institute for Inorganic Chemistry, University of Karlsruhe (TH), Engesserstr. 15 Geb. 30.45, D-76131 Karlsruhe, Germany
4 Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg, Denmark

* E-mail addresses of corresponding authors: Cherifa.Bachir{at}ifg.fzk.de, bachir_c04{at}yahoo.fr, peter.weidler{at}ifg.fzk.de

Pillared clays (PILCs) with magnetic properties are materials with potential for wide application in industry and the environment, but only a few studies of these types of materials have been carried out. The purpose of this study was to advance knowledge of the preparation and magnetic properties of pillared clays by examining in detail a series of magnetic Ti-pillared clays (Ti-M-PILCs). Samples were synthesized at ambient temperature by sodium borohydride reduction of ferrous ions added by ion-exchange to Ti-pillared montmorillonite (Ti-PILCs). The properties of the Ti-M-PILCs were investigated using a superconducting quantum interference device (SQUID) and Mössbauer spectroscopy. Hysteresis, zero-field-cooled (ZFC), and field-cooled (FC) regimes were measured on different precursor materials prepared by calcination of Ti-PILCs at temperatures between 200 and 600°C. Hysteresis loops, recorded between –7 and 7 T in the temperature range 200–300 K, were observed in most samples depending on the preparation of clays. The ZFC/FC measurements were made after heating from 2 to 300 K under an applied magnetic field of 39.8 kA m–1. The influence of the calcination temperature of the starting Ti-PILCs on the structural and magnetic properties of the Ti-M-PILCs was examined. The presence of two different Fe-alloy distributions was found; a dispersed one for the less-calcined Ti-PILCs and clusters for the more-calcined ones.

Key Words: Magnetic Properties • Montmorillonite • Mössbauer Spectroscopy • Titanium Magnetic Pillared Clays • ZFC/FC






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