波谱学杂志 ›› 1997, Vol. 14 ›› Issue (4): 281-285.

• 研究论文 • 上一篇    下一篇

纳米NiAl的电子自旋共振研究

侯碧辉1,2, 易俗1, 秦晓英3, 梁任又4   

  1. 1 中国科学技术大学物理系, 合肥 230026;
    2 南京大学固体微结构物理实验室, 南京 210093;
    3 中国科学院固体物理研究所, 合肥 230031;
    4 中国科学技术大学结构分析中心, 合肥 230026
  • 收稿日期:1997-03-03 修回日期:1997-03-24 出版日期:1997-08-05 发布日期:2018-01-22
  • 作者简介:侯碧辉,女,50岁,副教授

ESR IN NANOSTRUCTURED NiAl

Hou Bihui1,2, Yi Su1, Qin Xjaoying3, Liang Renyou4   

  1. 1 Department of Physics, University of Science and Technology of China, Hefei 230036;
    2 Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093;
    3 Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031;
    4 Laboratory of Structure and Analysis, University of Science and Technology of China, Hefei 230026
  • Received:1997-03-03 Revised:1997-03-24 Online:1997-08-05 Published:2018-01-22

摘要: 对纳米NiAl样品进行电子自旋共振(ESR)研究时发现晶粒尺寸效应产生的非磁-磁性转变.大块多晶NiAl合金的没有ESR信号,只有很弱的Pauli顺磁性.而粒径为8.6nm的纳米NiAl样品的ESR信号,随温度的增高而显著下降,其居里温度TC为124K,在室温下ESR信号很弱.8.6nm的纳米NiAl样品经550℃和707℃退火处理后得到粒径分别为12nm和21nm的两个样品,它们在室温下都有较强的ESR信号,并能够被永磁体吸起。多晶NiAl合金与纳米NiAl之间存在非磁-磁性转变,

关键词: 纳米材料, 镍铝合金, 电子自旋共振(ESR), 非磁-磁性转变

Abstract: By ESR study a size effect in nanostructured NiAl samples was found. There is no ESR signal in polycrystalline bulk NiAl alloy which only has very weak Pauli paramagnetism. The ESR signal of nanostructure NiAl (n-NiAl), whose grain size is about 8.6nm and TC is 124K, is weakelled with the increase of temperature. When the n-NiAl.was anneled at 550℃ and 707℃, the average grain sizes of the samples are 12nm and 21nm respectively, and their ESR signals are stronger, and both samples can be attracted by a permanent magnet. There is a nonmagnetism-magnetisnl transition between polycrystalline NiAl alloy and nanostructure NiAl.

Key words: Nanostructured material, NiAl alloy, ESR, Nonmagnetism-magnetism transition