无机材料学报

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纳米晶 Ni1-x ZnxFe2O4铁氧体粉料的制备及其磁性能研究

刘银1,2, 丘泰1

  

  1. 1. 南京工业大学材料学院, 南京 210009; 2. 安徽理工大学材料系, 淮南 232001

  • 收稿日期:2006-06-09 修回日期:2006-07-24 出版日期:2007-05-20 网络出版日期:2007-05-20

Synthesis and Magnetic Properties of Nanocrystalline Ni1-x ZnxFe2O4 Ferrite

LIU Yin 1,2, QIU Tai1   

  1. 1. School of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China; 2. Deptartment of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
  • Received:2006-06-09 Revised:2006-07-24 Published:2007-05-20 Online:2007-05-20

摘要:

采用喷射-共沉淀法制备了纳米晶Ni1-xZnxFe2O4 (0≤x≤1.0)铁氧体粉料. 通过TG-DSC、XRD、SEM、TEM、BET等测试手段分析了其微观结构和形貌, 用振动样品磁强计测量其室温下磁性能. 结果表明: 喷射-共沉淀法制备的粉料颗粒细小均匀、形状完整. 600℃下煅烧1.5h, 样品晶粒尺寸为30nm左右, 平均颗粒尺寸<100nm. 室温下, 样品比饱和磁化强度随Zn2+含量增加而变化, 当x=0.5时, 最大比饱和磁化强度σs为66.8A·m2/kg. 当晶粒大小为41nm时, 纳米晶Ni0.5Zn0.5Fe2O4铁氧体矫顽力达到最大值5.06kA/m, 随后又随晶粒尺寸增大而减小. 这归因于纳米晶软磁材料中强烈的无序磁晶各向异性模式的影响.

关键词: 纳米材料, Ni1-xZnxFe2O4铁氧体, 喷射-共沉淀法, 磁性能

Abstract:

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.

Key words: nanocrystalline materials, Ni1-xZnxFe2O4 ferrite, spraying-coprecipitation method, magnetic properties

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