Investigation of the precursors of γ-Fe2O3 in Fe2O3/SiO2 nanocomposites obtained through sol-gel

被引：35

作者：

Cannas, C

Concas, G

Falqui, A

Musinu, A ^{[1
]}

Spano, G

Piccaluga, G

机构：

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

[2] Univ Monserrato, Dipartimento Fis, I-09042 Monserrato, CA, Italy

[3] Cittadella Univ, INFM, I-09042 Monserrato, CA, Italy

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2001年 / 286卷 / 1-2期

关键词：

D O I：

10.1016/S0022-3093(01)00504-X

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The structure and the magnetic properties of a series of Fe2O3-SiO2 nanocomposites (16.9 and 28.5 wt% of Fe2O3/(Fe2O3 + SiO2)), prepared by a sol-gel method and submitted to thermal treatments in a temperature range 300-700 degreesC, were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), Mossbauer spectroscopy and magnetometry. Poorly crystallized particles, belonging to the 2-line ferrihydrite phase, were found in all the samples and recognized as precursors of the gamma -Fe2O3 that form in Fe2O3-SiO2 nanocomposites at T > 700 degreesC. The result was achieved through a detailed comparison of structural and magnetic properties of nanocomposites with a bulk iron (III) oxide hydrated reference sample. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：64 / 73

页数：10

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