Magnetic and Mössbauer spectroscopy studies of nanocrystalline iron oxide aerogels

E.E. Carpenter; J.W. Long; D.R. Rolison; M.S. Logan; K. Pettigrew; R.M. Stroud; Luise Theil Kuhn; Britt Rosendahl Hansen; Steen Mørup

doi:10.1063/1.2176894

Magnetic and Mössbauer spectroscopy studies of nanocrystalline iron oxide aerogels

E.E. Carpenter, J.W. Long, D.R. Rolison, M.S. Logan, K. Pettigrew, R.M. Stroud, Luise Theil Kuhn, Britt Rosendahl Hansen, Steen Mørup

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Abstract

A sol-gel synthesis was used to produce iron oxide aerogels. These nanocrystalline aerogels have a pore-solid structure similar to silica aerogels but are composed entirely of iron oxides. Mössbauer experiments and x-ray diffraction showed that the as-prepared aerogel is an amorphous or poorly crystalline iron oxide, which crystallized as a partially oxidized magnetite during heating in argon. After further heat treatment in air, the nanocrystallites are fully converted to maghemite. The particles are superparamagnetic at high temperatures, but the magnetic properties are strongly influenced by magnetic interactions between the particles at lower temperatures. ©2006 American Institute of Physics

Original language	English
Journal	Journal of Applied Physics
Volume	99
Issue number	8
Pages (from-to)	08N711
ISSN	0021-8979
DOIs	https://doi.org/10.1063/1.2176894
Publication status	Published - 2006

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Copyright (2006) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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AU - Carpenter, E.E.

AU - Long, J.W.

AU - Rolison, D.R.

AU - Logan, M.S.

AU - Pettigrew, K.

AU - Stroud, R.M.

AU - Kuhn, Luise Theil

AU - Hansen, Britt Rosendahl

AU - Mørup, Steen

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N2 - A sol-gel synthesis was used to produce iron oxide aerogels. These nanocrystalline aerogels have a pore-solid structure similar to silica aerogels but are composed entirely of iron oxides. Mössbauer experiments and x-ray diffraction showed that the as-prepared aerogel is an amorphous or poorly crystalline iron oxide, which crystallized as a partially oxidized magnetite during heating in argon. After further heat treatment in air, the nanocrystallites are fully converted to maghemite. The particles are superparamagnetic at high temperatures, but the magnetic properties are strongly influenced by magnetic interactions between the particles at lower temperatures. ©2006 American Institute of Physics

AB - A sol-gel synthesis was used to produce iron oxide aerogels. These nanocrystalline aerogels have a pore-solid structure similar to silica aerogels but are composed entirely of iron oxides. Mössbauer experiments and x-ray diffraction showed that the as-prepared aerogel is an amorphous or poorly crystalline iron oxide, which crystallized as a partially oxidized magnetite during heating in argon. After further heat treatment in air, the nanocrystallites are fully converted to maghemite. The particles are superparamagnetic at high temperatures, but the magnetic properties are strongly influenced by magnetic interactions between the particles at lower temperatures. ©2006 American Institute of Physics

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Magnetic and Mössbauer spectroscopy studies of nanocrystalline iron oxide aerogels

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