Novel Ferrimagnetic Iron Oxide Nanopowders
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- 作者：Kishori Deshpande ; Mikael Nersesyan ; Alexander Mukasyan ; and Arvind Varma
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2005
- 出版时间：August 3, 2005
- 年：2005
- 卷：44
- 期：16
- 页码：6196 - 6199
- 全文大小：361K
- 年卷期：v.44,no.16(August 3, 2005)
- ISSN：1520-5045
文摘
Because of their scientific and technological utility, magnetic properties of fine-particle systemshave assumed great importance in recent years. Maghemite (
-Fe2O3) and magnetite (Fe3O4)are commonly used in magnetic inks, as catalysts, and as ferrofluids for biomedical uses. In thecurrent work, we report a novel one-step process for the synthesis of different iron oxide phases,including maghemite and magnetite, using the aqueous combustion synthesis technique. Themethod involves a self-sustained reaction between an oxidizer (e.g., metal nitrate) and a fuel(e.g., glycine or hydrazine). Using this approach, for the first time, spherical, nanoscale (6-10nm) iron oxide particles with excellent ferrimagnetic properties were synthesized. While thesamples have particle sizes of <10 nm, they exhibit ferrimagnetic behavior at room temperature,as opposed to super-paramagnetism, as reported previously by numerous workers. Further,particularly for Fe3O4, the coercivity values are exceptionally high (213 Oe), indicating stablemagnetization.
-Fe2O3) and magnetite (Fe3O4)are commonly used in magnetic inks, as catalysts, and as ferrofluids for biomedical uses. In thecurrent work, we report a novel one-step process for the synthesis of different iron oxide phases,including maghemite and magnetite, using the aqueous combustion synthesis technique. Themethod involves a self-sustained reaction between an oxidizer (e.g., metal nitrate) and a fuel(e.g., glycine or hydrazine). Using this approach, for the first time, spherical, nanoscale (6-10nm) iron oxide particles with excellent ferrimagnetic properties were synthesized. While thesamples have particle sizes of <10 nm, they exhibit ferrimagnetic behavior at room temperature,as opposed to super-paramagnetism, as reported previously by numerous workers. Further,particularly for Fe3O4, the coercivity values are exceptionally high (213 Oe), indicating stablemagnetization.