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Neutron Diffraction Study of Mesoporous and Bulk Hematite, α-Fe2O3
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The University of Edinburgh.
, ‡Current address: Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
, §University of St. Andrews.
,
Institut Laue-Langevin.
,
Rutherford Appleton Laboratory.
Abstract
Variable temperature neutron diffraction was carried out on mesoporous α-Fe2O3 (hematite) with a mean pore diameter of 38.5 Å. Data were directly compared to measurements carried out on bulk hematite. Unlike bulk hematite, the mesoporous material does not undergo a spin−flop transition from a weak ferromagnet to a pure antiferromagnet (Morin transition, TM = 259.1(2)). Instead, the material remains a weak ferromagnet down to 2 K with the magnetic moments staying perpendicular to the R3̅c [111] ([003] in the hexagonal cell) direction rather than realigning (to) almost parallel to this direction. The angle of the magnetic Fe3+ moments to the [111] direction in the antiferromagnetic state also accurately was obtained for bulk hematite. Using magnetic hysteresis measurements, the canting angle responsible for weak ferromagnetism within the ab planes (hexagonal setting) was deduced for the mesoporous material at 12 K and compared to the angle made in bulk hematite above TM.
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This article has been cited by 2 ACS Journal articles (2 most recent appear below).
Magnetic Properties of Hematite Nanotubes Elaborated by Electrospinning Process
Cynthia Eid , Dominique Luneau , Vincent Salles , Roy Asmar , Yves Monteil , Antonio Khoury , and Arnaud BrioudeThe Journal of Physical Chemistry C 0 (ja),Magnetic Properties of Hematite Nanotubes Elaborated by Electrospinning Process
Cynthia Eid , Dominique Luneau , Vincent Salles , Roy Asmar , Yves Monteil , Antonio Khoury , and Arnaud BrioudeThe Journal of Physical Chemistry C 0 (ja),Hematite nanotubes are successfully prepared using an electrospinning technique and studied by superconducting quantum interference device (SQUID) magnetometry. At room temperature, the hysteresis properties observed are strongly controlled by the size of ...
Influence of Surface Effects on Magnetic Behavior of Hematite Nanoparticles Embedded in Porous Silica Matrix
Vladimir Zelenak, Adriana Zelenakova, Jozef Kovac, Ulla Vainio and Nataliya MurafaThe Journal of Physical Chemistry C2009 113 (30), 13045-13050Influence of Surface Effects on Magnetic Behavior of Hematite Nanoparticles Embedded in Porous Silica Matrix
Vladimir Zelenak, Adriana Zelenakova, Jozef Kovac, Ulla Vainio and Nataliya MurafaThe Journal of Physical Chemistry C2009 113 (30), 13045-13050Unique magnetic properties of superparamagnetic iron oxide (hematite) nanoparticles prepared by nanocasting in a periodic nanoporous silica (PNS) matrix are described in this work. The nanoparticles were prepared via a novel approach, when the external ...
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History
- Published In Issue August 12, 2008
- Article ASAPJuly 08, 2008
- Received: January 2, 2008
Revised: May 21, 2008
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