Structural, magnetic and thermal characterizations of Fe2O3 nanoparticle systems

被引：36

作者：

Ichiyanagi, Y ^{[1
]}

Kimishima, Y ^{[1
]}

机构：

[1] Yokohama Natl Univ, Dept Phys, Yokohama, Kanagawa 2408501, Japan

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2002年 / 69卷 / 03期

关键词：

DTA-TG; iron oxide; magnetization; nanoparticle;

D O I：

10.1023/A:1020672409713

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

X-ray, magnetic and differential thermal analysis and thermogravimetric (DTA-TG) measurements of Fe2O3 nanoparticles surrounded by amorphous SiO2 were carried out. The mass loss above 370 K could be attributed to the dehydration. The broadened exothermic peak around 900 K was observed by the DTA analysis. Considering the results of the X-ray and magnetic analyses, this anomaly was interpreted as due to the gamma-to alpha-transition in the present Fe2O3 nanoparticle system. The broadness of the peak and thus the gradual progress of the transformation would be attributed to the stress caused by the amorphous SiO2 network surrounding extremely small particles.

引用

页码：919 / 923

页数：5

共 5 条

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