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| Microstructure and magnetic characteristics of nanocrystalline Ni0.5Zn0.5 ferrite synthesized by a spraying-coprecipitation method | |
| 引用本文： | 刘 银,丘 泰. Microstructure and magnetic characteristics of nanocrystalline Ni0.5Zn0.5 ferrite synthesized by a spraying-coprecipitation method[J]. 中国物理, 2007, 16(12): 3837-3842 |
| 作者姓名： | 刘 银 丘 泰 |
| 作者单位： | College of Materials Science and Engineering, Nanjing University ofTechnology, Nanjing 210009, China;Department of Materials Science and Engineering, Anhui University ofScience and Technology, Huainan 232001, China;College of Materials Science and Engineering, Nanjing University ofTechnology, Nanjing 210009, China |
| 基金项目： | Project supported by the National Defence Foundation of China. |
| 摘 要： | Nanocrystalline Ni0.5Zn0.5 ferrite with average grain sizes ranging from 10 to 100 nm is prepared by using a spraying-coprecipitation method. The results indicate that the nanocrystalline Ni0.5Zn0.5 ferrite is ferromagnetic without the superparamagnetic phenomenon observed at room temperature. Specific saturation magnetization of nanocrystalline Nio.sZno.5 ferrite increases from 40.2 to 75.6 emu/g as grain size increases from 11 to 94nm. Coercivity of nanocrystalline Ni0.5Zn0.5 ferrite increases monotonically when d 〈 62 nm.The relationship between the coercivity and the mean grain size is well fitted into a relation Hc - d^3. A theoretically evaluated value of the critical grain size is 141nm larger than the experimental value 62nm for nanocrystalline Ni0.5Zn0.5 ferrite. The magnetic behaviour of nanocrystalline Ni0.5Zn0.5 ferrite may be explained by using the random anisotropy theory. |
| 关 键 词： | 晶体 物理结构 镍 微观结构 |
| 文章编号： | 1009-1963/2007/16（12）/3837-06 |
| 收稿时间： | 2007-03-13 |
| 修稿时间： | 2007-09-20 |
Microstructure and magnetic characteristics of nanocrystalline Ni0.5Zn0.5 ferrite synthesized by a spraying--coprecipitation method |
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| Liu Yin and Qiu Tai. Microstructure and magnetic characteristics of nanocrystalline Ni0.5Zn0.5 ferrite synthesized by a spraying--coprecipitation method[J]. Chinese Physics, 2007, 16(12): 3837-3842 | |
| Authors: | Liu Yin and Qiu Tai |
| Affiliation: | College of Materials Science and Engineering, Nanjing University ofTechnology, Nanjing 210009, China; College of Materials Science and Engineering, Nanjing University ofTechnology, Nanjing 210009, China;Department of Materials Science and Engineering, Anhui University ofScience and Technology, Huainan 232001, China |
| Abstract: | Nanocrystalline Ni$_{0.5}$Zn$_{0.5}$ ferrite with average grain sizesranging from 10 to 100~nm is prepared by using aspraying--coprecipitation method. The results indicate that thenanocrystalline Ni$_{0.5}$Zn$_{0.5}$ ferrite is ferromagnetic withoutthe superparamagnetic phenomenon observed at room temperature.Specific saturation magnetization of nanocrystallineNi$_{0.5}$Zn$_{0.5}$ ferrite increases from 40.2 to 75.6 emu/g asgrain size increases from 11 to 94nm. Coercivity of nanocrystallineNi$_{0.5}$Zn$_{0.5}$ ferrite increases monotonically when $d <62$~nm.The relationship between the coercivity and the mean grainsize is well fitted into a relation $H_{rm c }sim d^{3}$. Atheoretically evaluated value of the critical grain size is 141nmlarger than the experimental value 62nm for nanocrystallineNi$_{0.5}$Zn$_{0.5}$ ferrite. The magnetic behaviour ofnanocrystalline Ni$_{0.5}$Zn$_{0.5}$ ferrite may be explained byusing the random anisotropy theory. |
| Keywords: | nanocrystallinematerial Ni |
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