| CoFe2O4纳米颗粒磁性能的异常行为 |
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| 引用本文： | 訾振发,刘强春,戴建明,付彦坤.CoFe2O4纳米颗粒磁性能的异常行为[J].中国科学:物理学 力学 天文学,2012(3):242-248. |
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| 作者姓名： | 訾振发 刘强春 戴建明 付彦坤 |
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| 作者单位： | [1]合肥师范学院电子信息工程学院,合肥230601 [2]淮北师范大学物理与电子信息学院,淮北235000 [3]山东科技大学理学院,青岛266510 |
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| 基金项目： | 国家自然科学基金（批准号：51002156）; 安徽省科技厅重点科研计划（编号：09020204031）; 安徽省自然科学基金（编号：11040606M56）资助项目 |
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| 摘 要： | 采用改进的化学共沉法成功制备了CoFe2O4铁氧体纳米颗粒.X射线衍射谱表明样品具有单相的尖晶石结构,空间群为Fd3m-O7h;扫描电镜结果表明CoFe2O4纳米颗粒呈规则的球形,粒径尺寸主要分布在20-30nm之间;样品热磁曲线异常的不可逆行为被发现,并且升温测量过程中样品的居里温度稍高于重复测量的居里温度,可以解释为在磁性能测量过程中升降温改变了Co2＋在四面体位和八面体位之间的分布;CoFe2O4纳米颗粒样品的矫顽力低于理论值,这归因于我们合成的CoFe2O4纳米颗粒处于单畴结构状态和从亚铁磁到超顺磁的转变态.
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| 关 键 词： | CoFe2O4纳米颗粒 化学共沉法 单畴 超顺磁 |
Anomalous behavior of magnetic properties in CoFe204 ferrite nanoparticles |
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| ZI ZhenFa,LIU QiangChun,DAI JianMing＆ FU YanKun.Anomalous behavior of magnetic properties in CoFe204 ferrite nanoparticles[J].Scientia Sinica Pysica,Mechanica & Astronomica,2012(3):242-248. |
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| Authors: | ZI ZhenFa LIU QiangChun DAI JianMing＆ FU YanKun |
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| Institution: | 1 School of Electronic Information and Engineering, Hefei Normal University, Hefei 230601, China; 2 School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, China 3 College of Science, Shandong University of Science and Technology, Qingdao 266510, China |
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| Abstract: | CoFe2O4 ferrite nanoparticles were prepared by a modified chemical coprecipitation method. X-ray diffraction （XRD） results showed that the sample was single-phase with the space group Fd3m-OTh. The results of field-emission scanning electronic microscopy （FE-SEM） showed that the grains appeared spherical with diameters ranging from 20 to 30 nm. The Curie temperature in the process of increasing temperature was slightly higher than that in the process of the second measure. It can be understood by the fact that heating changed Co2＋ ions redistribution in tetrahedral and in octahedral sites. The coercivity of CoFe2O4 nanoparticles was lower than the theoretical values, which could be explained by the monodomain structure and a transformation from ferrimagnetic to superparamagnetic state. |
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| Keywords: | CoFe2O4 nanoparticles chemical coprecipitation method monodomain superparamagnetic |
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