Magnetic properties of spindle-type iron fine particles obtained from hematite

被引：28
|
作者：
Varanda, LC
Jafelicci, M
Goya, GF
机构：
[1] UNESP, Inst Quim, Dept Quim Fis, BR-14801970 Araraquara, SP, Brazil
[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 226卷
基金：
巴西圣保罗研究基金会;
关键词：
magnetic pigments; fine particles; magnetic recording media; iron particles;
D O I：
10.1016/S0304-8853(00)00668-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Spindle-type iron fine particles have been prepared by reduction of silica-coated-hematite particles. Hydrogen reduction of the coated-hematite cores yielded uniform spindle-type iron particles, which were stabilized by surface oxidation. Narrow particle distributions are observed from TEM measurements. X-ray, Mossbauer and magnetization data are in agreement with the presence of nanosized alpha -Fe particles, having surface layer of spinel structure oxide. Mossbauer spectra show that the oxide surface is superparamagnetic at room temperature. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：1933 / 1935
页数：3
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