Structural and Magnetic Properties of Zn-Doped Magnetite Nanoparticles Obtained by Wet Chemical Method

被引:12
|
作者
Ferrari, Sergio [1 ]
Aphesteguy, Juan Carlos [1 ]
Saccone, Fabio Daniel [1 ]
机构
[1] Ing Hilario Fernandez Long UBACONICET, Inst Tecnol & Ciencias Ingn, Buenos Aires, Argentina
关键词
Magnetic nanoparticles; Zn-doped magnetite; FERRITE NANOPARTICLES; BEHAVIOR;
D O I
10.1109/TMAG.2014.2377132
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The structural and magnetic properties of Fe(3-x)ZnxO4 (x : 0, 0.1, 0.2, 0.5, 1) nanoparticles, prepared by wet chemical method, have been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), Mossbauer spectroscopy, and magnetization measurements. The nanoparticles are polyhedrical-shaped with a narrow distribution in size as it was verified by SEM. By Rietveld analysis of XRD patterns, it was determined that the crystallites' sizes of Fe(3-x)ZnxO4 in spinel structure is in the range of 30 to 50 nm. Hysteresis cycles, measured at different temperatures (300, 200, 100, 50, and 7 K), showed an increase in saturation, while temperature is diminished, as it is expected. All the samples, exhibited a high blocking temperature of similar to 350 K, as it was determined by zero field cooling-field cooling measurements. This fact, reveals their strongly interacting superparamagnetic nature. Real ac susceptibility increases with temperature, while the imaginary part has a maximum, which depends on frequency, and it is related to a critical temperature, which depends on composition. A Neel-Arrhenius dependence of frequency on the critical temperature was found for all the samples. We determined a minimum of the effective anisotropy for x = 0.2.
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页数:6
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