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坡莫合金纳米粉的恒导磁性及其磁导率的压力、频率特性
引用本文:苏Fang 谢斌. 坡莫合金纳米粉的恒导磁性及其磁导率的压力、频率特性[J]. 高压物理学报, 1995, 9(4): 247-256
作者姓名:苏Fang 谢斌
作者单位:中国科学院结构分析开放实验室,中国科学技术大学基础物理中心,扬州大学师范学院物理系
摘    要: 用蒸发冷凝法制备了Fe-50wt%Ni和Fe-84wt%Ni坡莫合金的纳米微粉。经透射电镜X光能谱微区成分分析证实:微粉的成分与原材料的一致;微粉的平均粒径分别为16 nm(Fe-50Ni)和19 nm(Fe-84Ni)。在室温和36个不同的流体静压力(0.000 1~2.205 GPa)下原位测量了它们的磁化和起始磁化曲线。结果表明:(1)Fe-50wt%Ni和Fe-84wt%Ni合金纳米微粉均具有恒导滋特性;(2)这两种纳米粉的起始磁导率随静水压的变化分别为μi=8.16+18.2p-24.7p2+18.1p3-6.55p4+0.908p5(Fe-50Ni合金)和μi=5.38-0.169p+0.232p2-0.0786p3(Fe-84Ni合金);(3)纳米粉的起始磁导率μi在频率高于10 MHz才降低,而Fe-50Ni合金片的μi在频率高于1 MHz,Fe-84Ni高于100 kHz时就开始下降,故纳米压粉磁芯可应用的频率范围可以比相应组分合金片的大1~2个数量级。

关 键 词:镍铁合金  超微粉  磁导率  流体静压力  频率特性
收稿时间:1995-02-22;

CONSTANT MAGNETIC PERMEABILITY AND ITS BOTH PRESSURE AND FREQUENCY CHARACTERISTIC IN NANOMETER-SCALE ULTRAMICRON OF PORMALLOY
SU Fang,XIE Bin,CHEN Yun-Hong. CONSTANT MAGNETIC PERMEABILITY AND ITS BOTH PRESSURE AND FREQUENCY CHARACTERISTIC IN NANOMETER-SCALE ULTRAMICRON OF PORMALLOY[J]. Chinese Journal of High Pressure Physics, 1995, 9(4): 247-256
Authors:SU Fang  XIE Bin  CHEN Yun-Hong
Affiliation:1. Structure Research Laboratory, USTC, Academia Sinica, Hefei 230026, China;2. Center of Fundamental Physics, University of Science and Technology of China, Hefei 230026, China;3. Department of Physics, Normal College, University of Yangzhou, Yangzhou 225002, China
Abstract:By means of vacuum evaporation and condensation technique, nanometer-scale ultramicrons of Pormalloy (Fe-50wt%Ni, Fe-84wt%Ni) were prepared. It is found out with the method of TEM and X-ray diffraction that the composition of the ultramicron coincides with that of its mother alloy, and the average grain size is 16 nm (Fe-50Ni) and 19 nm (Fe-84Ni). Under room temperature and hydrostatic pressure of 36 various magnitudes ranging from 0.000 1 to 2.205 GPa the magnetization curve and initial magnetization curve were measured to reveal their relation with pressure. It is concluded: (1) The nanometer-scale ultramicron of both Pormalloy Fe-50wt%Ni and Fe-84wt%Ni possesses constant magnetic permeability; (2) Initial differential magnetic permeability, μi varies with the pressure as follows: μi=8.16+18.2p-24.7p2+18.1p3-6.55p4+0.908p5 (for Fe-50wt%Ni), μi=5.38-0.169p+0.232p2-0.0786p3 (for Fe-84wt%Ni); (3) μi of these ultramicrons decreases when f≥10 MHz, but μi of alloy Fe-50Ni goes down when f≥1 MHz, μi of alloy Fe-84Ni drops when f≥100 kHz, so applied frequency range of magnetic ultramicron core is one-two order of magnitude more than that of Pormalloy with the same composition.
Keywords:nickel-ferro alloys  super-fine grain  magnetic permeability  hydrostatic pressure  frequency characteristic.
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