Magnetic and Mossbauer spectroscopy studies of NiAl0.2Fe1.8O4/SiO2 nanocomposites synthesized by sol-gel method

被引：3
作者：
Li, Jiaming [1 ,2 ]
Wang, Li [1 ,3 ]
Bai, Zhaohui [2 ]
Li, Ji [1 ]
Lu, Jingbin [3 ]
Li, Haibo [1 ]
机构：
[1] Jilin Normal Univ, Minist Educ, Key Lab Funct Mat Phys & Chem, Siping 136000, Peoples R China
[2] Changchun Univ Sci & Technol, Sch Mat Sci & Engn, Changchun 130022, Peoples R China
[3] Jilin Univ, Coll hys, Changchun 130022, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2014年 / 354卷
基金：
中国国家自然科学基金;
关键词：
Sol-gel method; Nanocomposite; Magnetic dead layer; Mossbauer spectroscopy; FERRITE NANOPARTICLES; POWDERS;
D O I：
10.1016/j.jmmm.2013.11.017
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The structural and magnetic properties of NiAl0.2Fe1.8O4/SiO2 nanocomposites prepared with the sol-gel method were studied by using X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer, and Mossbauer spectroscopy. The average grain size of NiAlO2Fe1.8O4 in the nanocomposites was found to increase from 5 to 37 nm with increasing the annealing temperature from 800 to 1200 degrees C while the lattice constant was almost kept a constant of similar to 0.833 nm. The saturation magnetization of the nanocomposites was shown to increase with increasing the grain size. The thickness of the dead layer on the surface of the ferrite grain was obtained to about (0.61 +/- 0.02) nm. The Mossbauer spectra indicated the evolution of magnetic properties of NiAl0.2Fe1.8O4 nanoparticles in the nanocomposites from superparamagnetic to magnetically ordered character with increasing the size of nanoparticles. (C) 2013 Elsevier B.V. All rights reserved
引用
收藏
页码：190 / 194
页数：5
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