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磁場對納米MnZn鐵氧體前驅(qū)體形貌的影響
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TM271.2

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全國優(yōu)秀博士學(xué)位論文作者基金（200235）;國家自然科學(xué)基金（50404018）以及上海市科委納米專項基金（0252nm048）


Effect of Magnetic Field on the Morphology of Nano-MnZn Ferrite Precursor
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    摘要:

    采用SEM，XRD，TEM，TG等手段研究了磁場對共沉淀法制備納米MnZn鐵氧體前驅(qū)體形貌及晶態(tài)結(jié)構(gòu)的影響。結(jié)果表明，隨著磁感應(yīng)強度增大并達到某一臨界值時，納米顆粒形貌由球狀向鏈狀轉(zhuǎn)變，繼續(xù)增加磁感應(yīng)強度將獲得針狀、棒狀或纖維狀的顆粒，10T強磁場下獲得棒狀顆粒呈現(xiàn)單晶結(jié)構(gòu)。熱重分析表明10T磁場下獲得的納米顆粒由于單維尺寸增加而導(dǎo)致活性降低。根據(jù)晶體生長理論，討論了磁場影響納米顆粒形核和長大過程的機理。

    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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鐘云波 李志華 任忠鳴 鄧康 徐匡迪.磁場對納米MnZn鐵氧體前驅(qū)體形貌的影響[J].稀有金屬材料與工程,2006,35(8):1263~1267.[Zhong Yunbo, Li Zhihua, 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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  • 收稿日期:2005-06-08
  • 最后修改日期:2006-05-12
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