纳米金属镍的制备与磁性研究

稀有金属材料与工程, 2008, 37(3): 456-459.

纳米金属镍的制备与磁性研究

刘先松 ^1, , 陈鲁国 ^2, , 黄凯 ^3, , 周圣强 ^4, , ^5, , ^6, , ^7,

1.安徽大学,光电信息获取与控制教育部重点实验室,安徽,合肥,230039

2.安徽大学,光电信息获取与控制教育部重点实验室,安徽,合肥,230039

3.安徽建筑工业学院,安徽,合肥,230022

4.安徽大学,光电信息获取与控制教育部重点实验室,安徽,合肥,230039

5.The Physics Department and the Minerva Center, Bar-Ilan University, Ramat Gan 52900, Israel

6.The Physics Department and the Minerva Center, Bar-Ilan University, Ramat Gan 52900, Israel

7.Department of Chemistry, Bar-Ilan University, Ramat-Gan, 52900, Israel

基金项目: 安徽省信息材料与器件重点实验室(安徽大学)开放基金安徽省教育厅科研项目(2005KJ033ZD) 国家自然科学基金(50672001)

关键词：单分散镍球颗粒 , 磁性 , 磁滞回线 , 偏置

The Phase Transition from the Ferromagnetic to Superparamagnetic with Loop Shift about 5 nm Nickel Particles

采用微波polyol还原法成功地制备了单分散5～10 nm镍球颗粒,由高分辨率电子显微镜(HRTEM)观察证实, 5 nm镍的颗粒面间距为0.2033 nm,与文献报道的镍的FCC结构(100)面的0.2034 nm比较吻合[JCPDS: 4-850].通过在不同温度下测量零场冷(ZFC)和场冷(FC,1600 kA·m-1)所获样品的磁滞回线,发现纳米镍从铁磁性过渡到超顺磁性的相变温度Tpt=100 K,在Tpt温度以上,磁滞回线都发生偏置.

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