FeCo-SiO2 nanocomposite aerogels by high temperature supercritical drying

被引：38

作者：

Casula, MF ^{[1
]}

Corrias, A ^{[1
]}

Paschina, G ^{[1
]}

机构：

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

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2002年 / 12卷 / 05期

关键词：

D O I：

10.1039/b110093a

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：

FeCo-SiO2 nanocomposite aerogels were prepared by high temperature supercritical drying of alcogels obtained using tetraethoxysilane, iron nitrate and cobalt nitrate as precursors. The structural evolution of the samples at the various stages of the preparation was studied by thermal analysis, transmission electron microscopy, nitrogen physisorption measurements and X-ray diffraction. Different experimental conditions of the supercritical drying process give rise to different porous structures in the silica matrix which have a strong influence on the formation of the FeCo alloy nanoparticles. Bcc FeCo alloy nanoparticles of the expected composition are obtained in the microporous samples while in the mesoporous samples a bcc alloy with a lower Co content is obtained which is accompanied by pure fcc Co.

引用

页码：1505 / 1510

页数：6

共 37 条

[1] MEAN MAGNETIC MOMENTS IN BCC FE-CO ALLOYS [J].