Maghemite Interparticle Interactions in γ–Fe2O3/Ag nanocomposites

被引：0
作者：
J. M. Soares
D. S. Chaves
O. L. A. Conceição
A. L. Gurgel
M. M. Xavier
M. A. Morales
E. M. Baggio-Saitovitch
机构：
[1] Universidade do Estado do Rio Grande do Norte,Departamento de Física
[2] Universidade Federal Rural do Semi-Árido,Departamento de Ciências Exatas e Naturais
[3] Centro Brasileiro de Pesquisas Físicas,undefined
来源：
Journal of Superconductivity and Novel Magnetism | 2013年 / 26卷
关键词：
Nanoparticles; Maghemite; Superparamagnetic; Magnetic interactions;
D O I：
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中图分类号：
学科分类号：
摘要：
Maghemite and silver nanoparticles were prepared using the ionic coordination reaction technique. X-ray diffractograms (XRD) show that all the samples have a high degree of purity. The average particle sizes obtained by XRD and transmission electron microscopy (TEM) vary from 9 to 13 nm for the γ–Fe2O3 particles and from 130 to 142 nm for the Ag particles. The magnetic properties of the samples have been studied by room-temperature DC magnetization and Mössbauer spectroscopy. These measurements indicate the presence of γ–Fe2O3 particles with interparticle interactions of varying strength, resulting in three magnetic regimes: superparamagnetic, superparamagnetic with interactions, and blocked with interactions.
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页码：2467 / 2470
页数：3
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