Structural, magnetic and thermal characterizations of Fe2O3 nanoparticle systems
Structural, magnetic and thermal characterizations of Fe2O3 nanoparticle systems
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DOI：
10.1023/a:1020672409713
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发表时间：
2002-01-01
影响因子：
4.4
通讯作者：
Kimishima, Y
中科院分区：
文献类型：
--
作者：
Ichiyanagi, Y;Kimishima, Y
对被无定形SiO2包裹的Fe2O3纳米颗粒进行了x射线、磁性、差热分析和热重（DTA-TG）测量。370k以上的质量损失可归因于脱水。在900 K左右，DTA分析发现放热峰变宽。考虑到x射线和磁分析的结果，这种异常被解释为由于Fe2O3纳米颗粒体系中的γ -到α -转变。峰的宽度和转变的渐进过程可归因于围绕极小颗粒的无定形SiO2网络所产生的应力。
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.