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密堆六方结构Ni纳米颗粒的合成及其磁性

焦志伟1, 刘洋2, 王丽丽3, 杨景海2, 宗占国3, 宫杰3   

  1. 1. 中国计量学院 理学院物理系, 杭州 310018; 2. 吉林师范大学 物理学院, 吉林 四平 136000; 3. 长春大学 应用物理研究所, 长春 130022
  • 收稿日期:2007-11-28 修回日期:1900-01-01 出版日期:2008-07-26 发布日期:2008-07-26
  • 通讯作者: 宫杰

Synthesis and Magnetic Properties of Hexagonal Close-packed Ni Nanoparticles

JIAO Zhi wei1, LIU Yang2, WANG Li li3, YANG Jing hai2, ZONG Zhan guo3, GONG Jie3   

  1. 1. Department of Physics, College of Science, China Jiliang University, Hangzhou 310018, China; 2. College of Physics, Jilin Normal University, Siping 136000, Jilin Province, China; 3. Institute of Applied Physics, Changchun University, Changchun 130022, China
  • Received:2007-11-28 Revised:1900-01-01 Online:2008-07-26 Published:2008-07-26
  • Contact: GONG Jie

摘要: 采用溶胶-凝胶方法制备前驱体样品, 在氩气气氛中不同温度下热处理得到样品. 利用热分析仪、 X射线衍射(XRD)、 透射电子显微镜(TEM)和振动样品磁强计(VSM)研究材料的合成、 形貌、 结构及其磁性. 结果表明, 经300 ℃热处理的样品为具有密堆六方结构的球形Ni纳米颗粒, 且六方Ni单相具有铁磁性质, 平均晶粒尺寸即超顺磁临界尺寸约为12 nm, 室温下在-800~800 kA/m磁场范围内未表现出饱和趋势, 最大比磁化强度为0.58 (A·m2)/kg, 矫顽力为1.592 kA/m. 

关键词: 纳米Ni, 六角密堆积结构, 铁磁性

Abstract: The hexagonal close-packed Ni nanoparticles were synthesized with the precursor prepared by sol-gel method via heat-treating technique in Ar atmosphere. The synthesis condition, structural and magnetic properties of the samples were analysed by means of thermogravimetric analysis (TG), different thermal analysis (DTA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The results indicate that hcp Ni nanoparticles with spheric shape were synthesized by heating precursor at 300 ℃. The average grain size of the hcp Ni particles is evaluated to be about 12 nm via Scherrer equation. The RT magnetic measurement in 800 kA/m field for the samples suggests the unsaturated magnetization in hcp nanoparticles. It turns out that the hcp Ni nanoparticles have unique ferromagnetic with a magnetization of 0.58 (A·m2)/kg and a coercivity of 1.592 kA/m. The critical size of superparamagnetic behavior is near to 12 nm.

Key words: sol\|gel, Ni nanoparticles, hexagonal close\|packed, ferromagnetic behavior

中图分类号: 

  • O482.5