水热法制备酚醛树脂球模板尺寸对ZnFe<sub>2</sub>O<sub>4</sub>空心球磁性能的影响

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Abstract The phenolic resin microspheres using resorcinol and formaldehyde as reactants, ammonia as catalyst and anhydrous ethanol as dispersant were prepared by hydrothermal method. The hollow ferrite was prepared templated by phenolic resin microspheres, using ferric nitrate and zinc nitrate, ferric chloride and zinc chloride as precursors, respectively. The structure, morphology and particle size of phenolic resin spheres, as well as the crystal structure, chemical composition, micromorphology and magnetic properties of ZnFe₂O₄ spheres were characterized. The effect of template sphere size on the magnetic properties of zinc ferrite was investigated. The results show that the size of the phenolic resin sphere decreases with the stirring speed increasing or the amount of formaldehyde decreasing. The phenolic resin balls of different sizes can be obtained by controlling the proportion and amount of raw materials in the reaction system, the spherical surface is smooth, the sphericity is high, the size is uniform, and the monodispersity is good, and the surface contains a large amount of hydroxyl functional groups. ZnFe₂O₄ is a well-crystallized cubic spinel structure, which is a regular hollow sphere with good dispersibility and uniform size. As the size of the template decreases, the size of the ZnFe₂O₄ sphere gradually decreases, and it turn out the ferromagnetism transit to paramagnetic, and the saturation magnetization (Ms) gradually increases. When the template size is 271.8 nm, the saturation magnetization of the ZnFe₂O₄ sphere is 5.4 (A∙m²)/kg.

Key words： template method phenolic resin ball zinc ferrite particle size magnetic properties

Received: 22 October 2018 Published: 12 July 2019

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	WANG Zhilong
	GE Yicheng
	RAN Liping
	YI Maozhong

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WANG Zhilong,GE Yicheng,RAN Liping, et al. Effect of template size of phenolic resin spheres prepared by hydrothermal method on the magnetic properties of ZnFe₂O₄ hollow spheres[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(2): 137-146.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I2/137

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