Ordered mesoporous Fe2O3 with crystalline walls

Chadwick, A.V. and Jiao, F. and Bruce, P.G. and Harrison, A. and Jumas, J.C. and Kockelmann, W. (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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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: 06 Sep 2011 00:16
Resource URI: http://kar.kent.ac.uk/id/eprint/8948 (The current URI for this page, for reference purposes)
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