Annealing study of Fe2O3 nanoparticles: Magnetic size effects and phase transformations
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- X. N. Xu
- Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
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- Y. Wolfus
- Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
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- A. Shaulov
- Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
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- Y. Yeshurun
- Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
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- I. Felner
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
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- I. Nowik
- Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel
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- Yu. Koltypin
- Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
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- A. Gedanken
- Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel
書誌事項
- 公開日
- 2002-04-01
- DOI
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- 10.1063/1.1457544
- 公開者
- AIP Publishing
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説明
<jats:p>Sonochemically synthesized Fe2O3 nanoparticles were annealed in air or in vacuum while their magnetization was continuously recorded. Annealing in vacuum at temperatures Ta between 240 and 450 °C produced nanophases of γ-Fe2O3 with average particle size ranging from 4 to 14 nm, depending on Ta. Phase transformation into α-Fe2O3 occurred directly by annealing in air, or via an intermediate Fe3O4 phase by annealing in vacuum at temperatures higher than 450 °C. Mapping the correlation between the magnetic properties and the annealing conditions, enables control of the annealing process to obtain nanocrystals of γ-Fe2O3, α-Fe2O3, or Fe3O4 with different particle size and magnetic properties.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 91 (7), 4611-4616, 2002-04-01
AIP Publishing