Structure and magnetic properties of nanostructured Ni-ferrite

被引：117
作者：
Albuquerque, AS
Ardisson, JD
Macedo, WAA
López, JL
Paniago, R
Persiano, AIC
机构：
[1] Ctr Desenvolvimento Tecnol Nucl, BR-30123970 Belo Horizonte, MG, Brazil
[2] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 226卷 / 226-230期
关键词：
ferrites spinel; nanoparticles; Mossbauer spectroscopy; magnetic measurements;
D O I：
10.1016/S0304-8853(00)00915-X
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structural and magnetic properties of NiFe2 O-4 ultrafine powders synthesized by coprecipitation, a nonconventional method of preparation, were investigated. The samples were obtained by annealing at relatively low temperatures (300-600 degreesC) and characterized by X-ray diffraction, Mossbauer spectroscopy, and vibrating sample magnetometry. The average particle diameter ranges from 4 to 15 nm, as determined by X-ray diffraction. All nanometric powder samples presented strong superparamagnetic relaxation at room temperature and reduced magnetic hyperfine fields at - 193 degreesC. Magnetometry measurements indicated different magnetic behavior related with crystallinity of samples, coercivity as high as 168 Oe at 27 degreesC, value that is nearly two times higher than coercivity of bulk Ni-ferrite. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：1379 / 1381
页数：3
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