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

页码：1933 / 1935

页数：3

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