Self-aligned magnetic dipole moments of Fe2O3 formed within sol-gel matrix

被引：12

作者：

Zhang, Xiaoming

Guo, Haiquan

Chi, Ning

Wang, Shunchin C.

Yang, Nan-Loh

Akins, Daniel L.

机构：

[1] CUNY City Coll, CASI, Chem Dept, New York, NY 10031 USA

[2] CUNY Coll Staten Isl, Chem Dept, Staten Isl, NY 10314 USA

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2006年 / 98卷 / 2-3期

基金：

美国国家科学基金会;

关键词：

magnetic material; oxides; sol-gel growth; electron paramagnetic resonance (EPR);

D O I：

10.1016/j.matchemphys.2005.09.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fe2O3 nanoparticles were formed within SiO2 framework via a sol-gel co-precipitation synthesis route. Various weight percentages of Fe2O3 in the composites ranging from 8.6 to 52.8 wt.% were formulated. X-ray diffraction and Raman spectra indicated the formation of alpha-phase Fe2O3 nanoparticles. EPR spectra of the Fe2O3 nanocomposites were found to depend significantly on the weight composition of Fe2O3. The composite with a sufficiently large amount of Fe2O3 was found to show a nonzero absorption at zero-applied field, which indicates the partial alignment of magnetic dipole moments within the composites. From Q factor measurements we further found that such sufficiently loaded composites show substantial microwave absorption capability. (c) 2005 Elsevier B.V. All rights reserved.

引用

收藏

页码：207 / 211

页数：5

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