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首页> 外文期刊>Journal of magnetism and magnetic materials >Magnetic and Mossbauer spectroscopy studies of NiAl_(0.2)Fe_(1.8)O_4/SiO_2 nanocomposites synthesized by sol-gel method
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Magnetic and Mossbauer spectroscopy studies of NiAl_(0.2)Fe_(1.8)O_4/SiO_2 nanocomposites synthesized by sol-gel method

机译：溶胶-凝胶法合成NiAl_（0.2）Fe_（1.8）O_4 / SiO_2纳米复合材料的磁性和莫斯鲍尔光谱研究

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摘要

The structural and magnetic properties of NiAl_(0.2)Fe_(1.8)O_4/SiO_2 nanocomposites prepared with the sol-gel method were studied by using X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer, and Moessbauer spectroscopy. The average grain size of NiAl_(0.2)Fe_(1.8)O_4 in the nanocomposites was found to increase from 5 to 37 nm with increasing the annealing temperature from 800 to 1200 ℃ while the lattice constant was almost kept a constant of ～ 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 NiAl_(0.2)Fe_(1.8)O_4 nanoparticles in the nanocomposites from superparamag-netic to magnetically ordered character with increasing the size of nanoparticles.
机译：利用X射线衍射，透射电子显微镜，振动样品磁强计和Moessbauer光谱研究了溶胶-凝胶法制备的NiAl_（0.2）Fe_（1.8）O_4 / SiO_2纳米复合材料的结构和磁性。随着退火温度从800℃升高到1200℃，纳米复合材料中NiAl_（0.2）Fe_（1.8）O_4的平均晶粒尺寸从5nm增加到37nm，而晶格常数几乎保持恒定在〜0.833nm。纳米复合材料的饱和磁化强度随着晶粒尺寸的增加而增加。获得的铁素体晶粒表面上的死层厚度约为（0.61 + 0.02）nm。 Mossbauer光谱表明随着纳米粒子尺寸的增加，纳米复合材料中NiAl_（0.2）Fe_（1.8）O_4纳米粒子的磁性从超顺磁性转变为磁有序特征。

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  • 来源
    《Journal of magnetism and magnetic materials》 |2014年第3期|190-194|共5页
  • 作者

    Jiaming Li; Li Wang; Zhaohui Bai; Ji Li; Jingbin Lu; Haibo Li;

  • 作者单位

    Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China,School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China;

    Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China,College of Physics, Jilin University, Changchun 130012, Cihina;

    School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China;

    Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China;

    College of Physics, Jilin University, Changchun 130012, Cihina;

    Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China;

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  • 正文语种 eng
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  • 关键词

    Sol-gel method; Nanocomposite; Magnetic dead layer; Mossbauer spectroscopy;

    机译：溶胶-凝胶法纳米复合材料磁性死层;莫斯鲍尔光谱;

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