Synthesis and Magnetic Properties of Nanostructured Maghemite
Synthesis and Magnetic Properties of Nanostructured Maghemite
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DOI：
10.1557/jmr.1997.0291
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发表时间：
1997-08
影响因子：
2.7
通讯作者：
D. Vollath;D. Szabó;R. Taylor;J. Willis
中科院分区：
文献类型：
--
作者：
D. Vollath;D. Szabó;R. Taylor;J. Willis
以FeCl_3或Fe_3（CO）_12为前驱体，在微波等离子体中合成了纳米晶γ-Fe_2O_3。电子显微镜显示粒径在5至10 nm的范围内。一般来说，这种材料是超顺磁性的。磁性强烈地依赖于前体。在这两种情况下，生产过程导致高度无序的材料，其结果是低磁化。无序结构的假设也得到了电子能量损失（EEL）和穆斯堡尔谱的支持。这种材料的结构显示出在四面体和八面体晶格位点上几乎相同数量的阳离子。
Nanocrystalline maghemite, γ–Fe_2O_3, can be synthesized in a microwave plasma using FeCl_3 or Fe_3(CO)_12 as the precursor. Electron microscopy revealed particle sizes in the range of 5 to 10 nm. In general, this material is superparamagnetic. The magnetic properties are strongly dependent on the precursor. In both cases the production process leads to a highly disordered material with the consequence of a low magnetization. The assumption of a disordered structure is also supported by electron energy loss (EEL) and Mössbauer spectroscopy. The structure of this material shows a nearly identical number of cations on tetrahedral and octahedral lattice sites.