Clays and Clay Minerals, Vol. 57, No. 4, 433–443, 2009.
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Authors
Bachir, Cherifa
Lan, Yanhua
Mereacre, Valeriu
Powell, Annie K.
Koch, Christian Bender
Weidler, Peter G
Issue Date
2009
Type
Article
Language
Keywords
Periodicals , Geology , Magnetic Properties , Montmorillonite , Mossbauer Spectroscopy , Titanium Magnetic Pillared Clays , ZFC/FC
Alternative Title
Magnetic Titanium-pillared Clays (ti-m-pilc): Magnetic Studies And Mo¨ Ssbauer Spectroscopy
Abstract
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 ionexchange to Ti-pillared montmorillonite (Ti-PILCs). The properties of the Ti-M-PILCs were investigated using a superconducting quantum interference device (SQUID) and Mo¨ssbauer 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 600ºC. 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 Kunder 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 Fealloy distributions was found; a dispersed one for the less-calcined Ti-PILCs and clusters for the morecalcined ones.
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Citation
Clays and Clay Minerals, Vol. 57, No. 4, 433–443, 2009.
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