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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (11): 1322-1326. 上一篇    下一篇

研究论文

镝掺杂铁氧体纳米晶的制备、表征和磁性

蒋荣立*，陈文龙，张宗祥，孙强，尹文萱   

  1. (中国矿业大学化工学院 徐州 221116)
  • 投稿日期:2007-10-21 修回日期:2007-12-04 发布日期:2008-06-14
  • 通讯作者: 蒋荣立

Preparation, Characterization and Magnetic Properties of Ferrite Nanocrystals Doped with Dysprosium

JIANG, Rong-Li*; CHEN, Wen-Long; ZHANG, Zong-Xiang; SUN, Qiang; YIN, Wen-Xuan   

  1. (School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116)
  • Received:2007-10-21 Revised:2007-12-04 Published:2008-06-14
  • Contact: JIANG, Rong-Li

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被引次数

57 | 7

采用化学共沉淀法制备出了镝掺杂铁氧体纳米晶, 利用透射电子显微镜(TEM)、X射线衍射仪(XRD)、傅立叶红外光谱仪(FTIR)、古埃磁天平、振动样品磁强计(VSM)、X射线能谱仪(EDX)等仪器对产物进行了表征, 研究了Dy3＋掺杂量对铁氧体纳米晶的结构、磁性和粒度的影响. 结果表明: 适量稀土元素镝离子的掺杂可以提高尖晶石型铁氧体的磁性、降低矫顽力, 当n(Fe3＋)∶n(Dy3＋)＝14∶1时其磁性最强. Dy3＋替代或充填进入了尖晶石晶格, 且主要占据B位. 掺杂了镝的铁氧体磁性纳米粒子粒度变小, 且分布更集中、均匀, 当Dy3＋加入量为n(Fe3＋)∶n(Dy3＋)＝14∶1时铁氧体纳米粒子的平均粒径由掺杂前的14 nm降低到到8 nm. 这种具有超顺磁性的软磁铁氧体纳米晶可应用于纳米磁液领域.

关键词: 尖晶石, 铁氧体, 镝, 掺杂, 磁性

Dy3＋-doped ferrite nanocrystals were prepared by a chemical co-precipitation method and characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Gouy magnetic balance, vibrating sample magnetometer (VSM), and X-ray energy spectrum (EDX), respectively. The effects of dysprosium contents on structure, magnetic properties and size of the ferrite were investigated. The results show that Dy3＋can enhance the magnetic properties which are strongest while n(Fe3＋)∶n(Dy3＋) is 14∶1 among the samples prepared, and weaken the coercive force of the spinel ferrite. Dy3＋ fills in the spinel ferrite lattice and mostly enters B site. The size of the Dy-doped ferrite nanoparticles becomes smaller and their distribution is more concentrated and uniform. The average diameter of the ferrite nanoparticles is 14 nm before doping and reduces to 8 nm after doping when n(Fe3＋)∶n(Dy3＋) is 14∶1. The results support the concept that the soft magnetic ferrite nanocrystals with superparamagnetism can be applied to nanometer magnetic fluid field.

Key words: spinel, ferrite, dysprosium, doping, magnetic property