Synthesis and characterization of hollow α-Fe2O3 sub-micron spheres prepared by sol-gel

被引：15

作者：

Leon, Lizbet ^{[1
]}

Bustamante, Angel ^{[1
]}

Osorio, Ana ^{[1
]}

Olarte, G. S. ^{[1
]}

Valladares, Luis De Los Santos ^{[2
,3
]}

Barnes, Crispin H. W. ^{[2
]}

Majima, Yutaka ^{[3
,4
]}

机构：

[1] Univ Nacl Mayor San Marcos, Lima 14, Peru

[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[3] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[4] Japan Sci & Technol Agcy JST, CREST, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

HYPERFINE INTERACTIONS | 2011年 / 202卷 / 1-3期

基金：

日本学术振兴会;

关键词：

Sol-gel method; Mossbauer spectroscopy; Hematite; Maghemite; MAGNETIC-PROPERTIES; HEMATITE PARTICLES; NANOPARTICLES; OXIDES; SIZE;

D O I：

10.1007/s10751-011-0353-1

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

In this work we report the preparation of magnetic hematite hollow submicron spheres (alpha-Fe2O3) by colloidal suspensions of ferric nitrate nine-hydrate (Fe(NO3)(3)center dot 9H(2)O) particles in citric acid solution by following the sol-gel method. After the gel formation, the samples were annealed at different temperatures in an oxidizing atmosphere. Annealing at 180 degrees C resulted in an amorphous phase, without iron oxide formation. Annealing at 250 degrees C resulted in coexisting phases of hematite, maghemite and magnetite, whereas at 400 degrees C, only hematite and maghemite were found. Pure hematite hollow sub-micron spheres with porous shells were formed after annealing at 600 degrees C. The characterization was performed by X-ray diffraction (XRD), Mossbauer spectroscopy (MS) and scanning electron microscopy (SEM).

引用

页码：131 / 137

页数：7

共 30 条

[1] MORIN TEMPERATURE OF ANNEALED SUBMICRONIC ALPHA-F2O3 PARTICLES [J].