Journal of Inorganic Materials >
Synthesis and Magnetic Properties of Nanocrystalline Ni1-x ZnxFe2O4 Ferrite
Received date: 2006-06-09
Revised date: 2006-07-24
Online published: 2007-05-20
Nanocrystalline Ni1-x ZnxFe2O4 ferrite with 0≤x≤1, was successfully prepared by a spraying-coprecipitation method. The microstructure was investigated by using TG-DSC, XRD, SEM, TEM as well as BET. Magnetic properties were measured with a vibrating sample magnetometer (VSM) at room temperature. The results show that uniform and fine nanocrystalline Ni1-xZnxFe2O4 ferrite powders are obtained by the spraying-coprecipitation method. The grain size is about 30 nm calcined at 600 for 1.5h. There are a few agglomerates with average sizes below 100nm. The specific saturation magnetization of nanocrystallineNi1-x ZnxFe2O4 ferrite increases with the concent of Zn2+ at room temperature, and maximum σs is 66.8A·m2/kg as the content of Zn2+ is around 0.5. When the grain size is 41nm, the coercivity Hc of nanocrystalline Ni0.5Zn0.5Fe2O4 ferrite arrives at 5.06kA/m, and then it decreases with the increase of the grain size. The results may be explained in terms of intense random magnetocrystalline anisotropy model in nanocrystalline materials.
LIU Yin , QIU Tai . Synthesis and Magnetic Properties of Nanocrystalline Ni1-x ZnxFe2O4 Ferrite[J]. Journal of Inorganic Materials, 2007 , 22(3) : 391 -394 . DOI: 10.3724/SP.J.1077.2007.00391
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