Preparation of Hollow Microspheres of ZnxCo1-xFe2O4 Magnet

doi:10.11901/1005.3093.2014.174

Chinese Journal of Materials Research

2014, Vol. 28

Issue (10): 763-768 DOI: 10.11901/1005.3093.2014.174

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Preparation of Hollow Microspheres of Zn_xCo_1-_xFe₂O₄ Magnet

Hongzhen DUAN(

),Liping CHEN Guohong ZHAO

Department of Chemistry, School of Science, North University of China, Taiyuan 030051

Cite this article:

Hongzhen DUAN,Liping CHEN Guohong ZHAO. Preparation of Hollow Microspheres of Zn_xCo_1-_xFe₂O₄ Magnet. Chinese Journal of Materials Research, 2014, 28(10): 763-768.

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Abstract

Hollow microspheres of Zn_xCo_1-xFe₂O₄ were synthesized by ultrasonic assisted solvothermal method. The microstructure and morphology of synthesized microspheres were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The results show that hollow microspheres of Zn_xCo_1-xFe₂O₄show cubic crystallographic structure which indicated that the doping of Zn²⁺had no effect on the crystal type, but it induced change in the size of the microspheres. The average diameter forhollow microspheres of CoFe₂O₄ and Zn_0.5Co_0.5Fe₂O₄were 50 nm and 200 nm respectively. The performance of magnetism and microwave absorbing of the microspheres were investigated by a vibrating magnetometer(VSM) and a network vector analyzer respectively. Results show that with the increasing of Zn²⁺ content, the saturation magnetization of the Zn_xCo_1-_xFe₂O₄ hollow microspheres increased slightly and then decreased, while the coercive force decreased. When x=0.3 the Zn_xCo_1-_xFe₂O₄ hollow microspheres exhibit the best performance both in magnetism and microwave absorbing.

Key words: inorganic non-metallic materials Zn_xCo_1-_xFe₂O₄ hollow microspheres ultrasonic solvothermal method magnetic properties microwave absorbing properties

Received: 08 April 2014

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.174 OR https://www.cjmr.org/EN/Y2014/V28/I10/763

Fig.1 XRD spectra of CoFe₂O₄ (a) and Zn_0.5Co_0.5Fe₂O₄ (b) hollow microsphere

Fig.2 TEM images of CoFe₂O₄ (a) and Zn_0.5Co_0.5Fe₂O₄ (b) hollow microsphere

Fig.3 VSM pattern of Zn_xCo_1-_xFe₂O₄ hollow microsphere (a) CoFe₂O₄; (b) Zn_0.1Co_0.9Fe₂O₄; (c) Zn_0.3Co_0.7Fe₂O₄; (d) Zn_0.5Co_0.5Fe₂O₄

Table 1 Magnetic properties of Zn_xCo_1-_xFe₂O₄ hollow microsphere

Fig.4 Microwave absorbing of Zn_xCo_1-_xFe₂O₄ hollow microsphere

Table 2 Microwave absorbing properties of Zn_xCo_1-_xFe₂O₄ hollow microsphere

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