Ordered mesoporous Fe2O3 with crystalline walls

Chadwick, Alan V. and Jiao, Feng and Bruce, Peter G. and Harrison, Andrew and Jumas, Jean-Claude and Kockelmann, Winfried (2006) Ordered mesoporous Fe2O3 with crystalline walls. Journal of the American Chemical Society, 128 (16). pp. 5468-5474. ISSN 0002-7863 . (Access to this publication is restricted)

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http://dx.doi.org/10.1021/ja0584774

Abstract

alpha-Fe2O3 has been synthesized with an ordered mesoporous structure and crystalline walls that exhibit a near-single crystal-like order. The unique magnetic behavior of the material, distinct from bulk nanoparticles of alpha-Fe2O3 or mesoporous Fe2O3 with disordered walls, has been established. Magnetic susceptibility, Mossbauer, and neutron diffraction data show that the material possesses the same long-range magnetic order as bulk alpha-Fe2O3, despite the wall thickness being less than the 8 nm limit below which magnetic ordering breaks down in nanciparticulate alpha-Fe2O3, yet the Morin transition of bulk alpha-Fe2O3 is absent. It is also shown by TEM, PXRD, and EXAFS that alpha-Fe2O3 with the same ordered mesoporous structure but disordered walls contains small crystalline domains. Mossbauer and magnetic susceptibility data demonstrate that this material exhibits no long-range magnetic order but superparamagnetic behavior.

Item Type: Article
Projects: [40] ALISTORE
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Alan Chadwick
Date Deposited: 12 Sep 2008 20:04
Last Modified: 28 Apr 2014 14:43
Resource URI: http://kar.kent.ac.uk/id/eprint/8948 (The current URI for this page, for reference purposes)
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