| 磁场对纳米MnZn铁氧体前驱体形貌的影响 |
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| 引用本文： | 钟云波,李志华,任忠鸣,邓康,徐匡迪.磁场对纳米MnZn铁氧体前驱体形貌的影响[J].稀有金属材料与工程,2006,35(8):1263-1267. |
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| 作者姓名： | 钟云波 李志华 任忠鸣 邓康 徐匡迪 |
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| 作者单位： | 上海大学,上海市现代冶金与材料制备重点实验室,上海,200072 |
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| 基金项目： | 教育部全国优秀博士学位论文作者专项基金;国家自然科学基金;上海市纳米科技专项基金 |
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| 摘 要： | 采用SEM，XRD，TEM，TG等手段研究了磁场对共沉淀法制备纳米MnZn铁氧体前驱体形貌及晶态结构的影响。结果表明，随着磁感应强度增大并达到某一临界值时，纳米颗粒形貌由球状向链状转变，继续增加磁感应强度将获得针状、棒状或纤维状的颗粒，10T强磁场下获得棒状颗粒呈现单晶结构。热重分析表明10T磁场下获得的纳米颗粒由于单维尺寸增加而导致活性降低。根据晶体生长理论，讨论了磁场影响纳米颗粒形核和长大过程的机理。
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| 关 键 词： | 纳米 MnZn铁氧体 磁场 晶体生长 形核 |
| 文章编号： | 1002-185X(2006)08-1263-05 |
| 收稿时间： | 2005-06-08 |
| 修稿时间： | 2006-05-12 |
Effect of Magnetic Field on the Morphology of Nano-MnZn Ferrite Precursor |
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| Zhong Yunbo,Li Zhihu,Ren Zhongming,Deng Kang,Xu Kuangdi.Effect of Magnetic Field on the Morphology of Nano-MnZn Ferrite Precursor[J].Rare Metal Materials and Engineering,2006,35(8):1263-1267. |
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| Authors: | Zhong Yunbo Li Zhihu Ren Zhongming Deng Kang Xu Kuangdi |
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| Abstract: | Effect of magnetic field on the shape and crystalstructure of nano MnZn ferrite precursor prepared by co-precipitation way was studied by using SEM, XRD, TEM and TG. It was shown that the morphology of nano particles would change from spheric to chain-like with increasing the magnetic field to a certain critical value. The claviform-like nano particles obtained in a magnetic field of 10 T showed the structure information of single crystal. Thermal gravity curve revealed that the activity of nano particles was reduced in a magnetic field of 10 T due to the increase of one dimension size. The mechanism of magnetic field effect on the nano particle nucleation and growth was discussed by crystal growth theory. |
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| Keywords: | nanoparticle MnZn ferrite magnetic field crystal growth nucleation |
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