Magnetic properties of γ-Fe2O3-SiO2 aerogel and xerogel nanocomposite materials

被引：70

作者：

Cannas, C

Casula, MF

Concas, G

Corrias, A

Gatteschi, D

Falqui, A

Musinu, A

Sangregorio, C

Spano, G

机构：

[1] Univ Cagliari, Dipartimento Sci Chim, I-09042 Cagliari, Italy

[2] Univ Cagliari, Dipartimento Fis, I-09042 Cagliari, Italy

[3] Ist Nazl Fis Mat, I-09042 Cagliari, Italy

[4] Univ Florence, Dipartimento Chim, I-50144 Florence, Italy

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2001年 / 11卷 / 12期

关键词：

D O I：

10.1039/b104562h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The properties of aerogel and xerogel iron oxide-silica nanocomposites prepared by the sol-gel method were investigated by thermal analysis, X-ray diffraction, transmission electron microscopy, Mossbauer spectroscopy and susceptibility measurements. Pure maghemite nanoparticles were obtained starting from both xerogel and aerogel samples, with particles of average size around 5 nm which tend to aggregate into the silica matrix. The role of magnetic interparticle interactions, which have a strong influence on the magnetic properties, is discussed.

引用

页码：3180 / 3187

页数：8

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