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Effect of Bi2O3 addition on structure and magnetic properties of Ni0.5Zn0.5Fe2O4 nanofibers

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Abstract

Ni0.5Zn0.5Fe2O4 nanofibers with addition of 0–5 wt% Bi2O3 were synthesized by calcination of the electrospun polyvinylpyrrolidone/inorganic composite nanofibers at the temperature below the melting point of Bi2O3. The effects of Bi2O3 addition on the phase structure, morphology and magnetic properties of the nanofibers were investigated by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, selected area electron diffraction and vibrating sample magnetometer. It is found that the nanofiber diameter, crystallite size and magnetic parameters can be effectively tuned by simply adjusting the amount of Bi2O3 addition. The average diameter of Ni0.5Zn0.5Fe2O4 nanofibers doped with different contents of Bi2O3 ranges from 40 to 63 nm and gradually decreases with increasing Bi2O3 content. The addition of Bi2O3 does not induce the phase change and all the samples are a single-phase spinel structure. The amorphous Bi2O3 tends to concentrate on the nanoparticle surface and/or grain boundary and can retard the particles motion as well as the grain growth, resulting in a considerable reduction in grain size compared to the pristine sample. The specific saturation magnetization and coercivity of the nanofibers gradually decrease with the increase of Bi2O3 amount. Such behaviors are explained on the basis of chemical composition, surface effect, domain structure and crystal anisotropy.

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Acknowledgments

This work was financially supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 11KJB430006), the QingLan Project Foundation of Jiangsu Province and the Program for the Young Core Teacher of Jiangsu University of Science and Technology.

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Authors and Affiliations

  1. School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Jun Xiang, Guangzhen Zhou, Yanqiu Chu & Yintao Guo

  2. School of Material Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    Xiangqian Shen

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  1. Jun Xiang
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  2. Guangzhen Zhou
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  3. Xiangqian Shen
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  4. Yanqiu Chu
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Correspondence to Jun Xiang.

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Xiang, J., Zhou, G., Shen, X. et al. Effect of Bi2O3 addition on structure and magnetic properties of Ni0.5Zn0.5Fe2O4 nanofibers. J Sol-Gel Sci Technol 62, 186–192 (2012). https://doi.org/10.1007/s10971-012-2707-9

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  • DOI: https://doi.org/10.1007/s10971-012-2707-9

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