Journal article
Magnetic and Mössbauer spectroscopy studies of nanocrystalline iron oxide aerogels
Department of Physics, Technical University of Denmark1
Thermo Ceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Quantum Physics and Information Technology, Department of Physics, Technical University of Denmark5
Center for Nanoteknologi, Centers, Technical University of Denmark6
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
| Language: | English |
|---|---|
| Publisher: | American Institute of Physics |
| Year: | 2006 |
| Proceedings: | 50th Annual Conference on Magnetism and Magnetic Materials |
| ISSN: | 10897550 and 00218979 |
| Types: | Journal article |
| DOI: | 10.1063/1.2176894 |
