Investigation of the structure, elemental and phase compositions of Fe3O4-SiO2 composite layers by scanning electron microscopy, X-ray spectroscopy, and thermal nitrogen desorption methods

被引：13

作者：

Al'myashev, V. I. ^{[1
]}

Gareev, K. G. ^{[1
]}

Ionin, S. A. ^{[1
]}

Levitskii, V. S. ^{[1
,2
]}

Moshnikov, V. A. ^{[1
,3
]}

Terukov, E. I. ^{[1
,2
]}

机构：

[1] St Petersburg Electrotech Univ LETI, St Petersburg 197376, Russia

[2] Russian Acad Sci, AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

[3] Yaroslav The Wise Novgorod State Univ, Velikii Novgorod 173003, Russia

来源：

PHYSICS OF THE SOLID STATE | 2014年 / 56卷 / 11期

基金：

俄罗斯基础研究基金会;

关键词：

SILICA MICROSPHERES; HEMATITE; MAGHEMITE; SYSTEMS; GROWTH;

D O I：

10.1134/S1063783414110031

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The composite layers formed by drying a Fe3O4-SiO2-based colloidal solution were studied. The colloidal solution was obtained by the precipitation of Fe3O4 in the presence of highly dispersed silicon dioxide synthesized by the sol-gel method from a tetraethoxysilane alcohol solution. The microstructure and composition of the layers were analyzed using scanning electron microscopy, energy-dispersive X-ray microanalysis, thermal nitrogen desorption, and Raman spectroscopy. The emphasis was placed on the study of phase transitions in iron oxides under laser radiation. It was found that the tetraethoxysilane content has a substantial influence on the ratio of iron oxide and silicon dioxide in the layer, the specific surface area of SiO2 powders, the threshold laser radiation power necessary to induce the Fe3O4 alpha -Fe2O3 phase transformation, and on the position of the maximum of the absorption band corresponding to the A (1g) vibrations in alpha-Fe2O3.

引用

页码：2155 / 2159

页数：5

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