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

被引：13
|
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).
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页码：131 / 137
页数：7
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