Optical and magnetic properties of monodispersed α-Fe2O3 nanoparticle aggregates

被引：0
作者：
Ramachandran, B. [1 ]
Rao, M. S. Ramachandra [1 ]
机构：
[1] Indian Inst Technol, Mat Sci Res Ctr, Madras 600036, Tamil Nadu, India
来源：
MAGNETIC MATERIALS | 2008年 / 1003卷
关键词：
hematite; nanoparticles; superparamagnetism and blocking temperature; CRYSTAL-GROWTH; KINETICS;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Monodispersed alpha-Fe2O3 nanoparticle aggregates with diameter similar to 15 nm were successfully prepared by polyol process. The finite size effects in alpha-Fe2O3 nanoparticles were studied by X-ray diffraction, transmission electron microscopy, diffuse reflectance spectroscopy and ac-magnetic susceptibility. The optical band gap of alpha-Fe2O3 nanoparticles was significantly reduced compared to that of precursor. The alpha-Fe2O3 nanoparticles exhibited superparamagnetic behavior at room temperature, with blocking temperature T-B = 100 K at 313 Hz and its value shifted to 124 K at 3.13 KHz. Analysis of ac-magnetic susceptibility data gives a superparamagnetic relaxation time (To) of 4 X 10(-9) s.
引用
收藏
页码：91 / 93
页数：3
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