(Nd1－xGdx)3Fe27.31Ti1.69化合物的结构和磁性

通过X射线衍射和磁性测量等手段研究了(Nd_1-xGd_x)₃Fe_27.31Ti_1.69(0≤x≤0.6)化合物的结构和磁性.X射线衍射测量结果表明Gd替代后并未改变Nd₃(Fe,Ti)₂₉化合物的晶体结构，但引起了晶胞体积收缩.随着Gd含量的增加，化合物的居里温度T_C和室温磁晶各向异性场B_a单调增加，而自旋重取向 关键词： 1-xGd_x)₃Fe_27.31Ti_1.69化合物')" href="#">(Nd_1-xGd_x)₃Fe_27.31Ti_1.69化合物 磁晶各向异性 自旋重取向 磁相图     

过渡族元素对非晶态Nd15Fe79B6合金磁性的影响

本文讨论了用熔态急冷法制备的非晶态Nd₁₅Fe₇₉B₆合金中,掺杂Nb,V,Cr,Mn,Co,Ni和Cu等元素后,对磁矩、居里温度及晶化温度的影响。还用穆斯堡尔谱估计了掺杂后样品内场的变化,并作了合理的解释。 关键词：     

Nd-Fe(Co,Nb)-B交换耦合磁体的磁性

用熔体快淬法结合热处理制备了高性能纳米复合永磁合金Nd₉Fe_85.5-xCo_xNb₁B_4.5(0≤x≤16).最佳磁性能对应的成分为Nd₉Fe_81.5Nb₁B_4.5,其永磁性能如下：最大磁能积(BH)_max＝156kJ/m³,剩磁J_r＝1.11T 关键词：     

非晶态Fe90-xMnxZr10合金的磁性

本文报道用单辊急冷方法制备的非晶态合金Fe_90-xMn_xZr₁₀(x=0,4,6,10,15)的磁性,讨论了样品中每个原子的平均磁矩和居里温度T_c随Mn含量x的变化以及类自旋玻璃特性,给出了非晶态Fe_90-xMn_xZr₁₀合金的磁相图。观察到非晶态Fe₈₄Mn₆Zr₁₀合金晶化后的热磁曲线 关键词：     

非晶态FeZrB合金的电阻率与温度的关系

本文研究了非晶态(Fe_1-xZr_x)_84.5B_15.5(x=0,0.02,0.04,0.06,0.08,0.1,0.15)和Fe_90-xB_xZr₁₀(x=0,4,10,16,20)合金的电阻率ρ与温度T的关系。实验结果表明,当Zr含量在0.02≤x≤0.08时,ρ-T曲线出现两个线性斜率,在略高于居里温度T_c处出现转折,在T关键词：     

Fe基非晶态合金的低温电阻研究

本文报道Fe_100-xB_x,Fe_87-xSi_xB₁₃,(Fe_1-xCo_x)₇₈Si_9.5B_12.5,(Fe_1-xM_x)_80-84B_16-20(M=Zr,V,Nb,Ta,Cr,Mo,W,Mn)非晶态合金的 关键词：     

复相Nd4.5Fe76.3Ga0.3Co1.0B18合金的结构与磁性

利用快淬法制备了Nd_4.5Fe_76.3Ga_0.3Co_1.0B₁₈非晶合金,晶化处理后获得主相为Fe₃B与Nd₂Fe₁₄B的纳米晶永磁材料.采用X射线衍射、透射电子显微镜及磁测量手段分析研究了材料的微观结构与磁性能,并通过测量磁体的δM曲线,研究了晶粒间的交换耦合作用及其与微观结构、磁性能的关系. 关键词：     

组份对铁基非晶合金晶化温度的影响

本文系统研究了(Fe_1-xM_x)₈₄B₁₆系非晶合金(x=0.02—0.20;M=Ti,Zr,V,Nb,Ta,Cr,Mo,W,Mn,Co,Ni)的晶化温度与组成的关系。晶化温度随M=VIIB,VIB,VB,IVB元素的顺序和x值的增大而提高。M=VIII族(CO,Ni)元素时,晶化温度基本相同,并随x值的增大略有降低。对于被研究的95个Fe基非晶合金,晶化温度在700—825K的约占85％,熔点Tm/晶化温度T_cr约为1/2,在0.42—0.62之间,符合Sakka规则。Fe_1-x-yB_xSi_y的T_cr>Fe_1-xB_x>Fe_1-x-yB_xP_y。对上述规律性,从组份、扩散、相图以及晶化温度与合金元素外层平均电子浓度/α的关系进行了讨论。 关键词：     

成分和过渡金属对FeZr基非晶态合金晶化温度的影响

本文系统研究了Fe_100-xZr_x,(Fe_1-xZr_x)₈₄B₁₆和Fe_90-xM_xZr₁₀(M=V,Cr,Mn,Co,Ni,Si,B)非晶态合金的晶化温度与成分的关系。主要结果有:用Zr替代Fe使晶化温度明显提高;在FeMZr非晶态合金系列中,晶化温度依M=Mn,Cr,V元素的顺序和M含量x的增大而提高,而依 关键词：     

Ni83Cr7Fe3Si4B3非晶态合金在常压及高压下的晶化过程

本文研究了Ni₈₃Cr₇Fe₃Si₄B₃非晶态合金在1bar及100kbar压力下的晶化过程,得到了“时间-温度-变态”图。其结果表明:经高压热处理后的非晶合金其晶化温度降低,fcc-Ni相区域加宽及亚稳Ⅱ相没有形成。另外,还分别计算了常压及100kbar压力下的晶化激活能。 关键词：     

MAGNETIC PROPERTIES AND CRYSTALLIZATION OF THE RAPIDLY QUENCHED (Fe1-xNdx) 81.5B18.5 ALLOYS

Magnetic properties and crystallization behaviors of amorphous (Fe_1-xNd_x) _81.5B_18.5 alloys were studied. The crystallization temperature is found to rise at first and then drop monotonically with x, having a maximum value of 976K at x=0.11 (9at% Nd). The (Fe_1-xNd_x) _81.5B_18.5 alloys prepared at a quenching rate of v_s = 6.6m /s are amorphous, and exhibit good glass formability. Both the coercive field H_c and energy product (BH)_max depend strongly on Nd concentration. Amorphous (Fe_1-xNd_x) _81.5B_18.5 alloys with higher Nd concentration have a high coercive field at low temperature, due to the large random uniaxial anisotropy of Nd. The room-temperature H_c and (BH)_max obtained on optimal annealing con-ditions show two maxima as a function of Nd concentration x. The highest room-temperature coercive field H_c =22 kOe within the Nd concentrations around x=0.368 and the maximum energy product(RH)_max= 13.3 MG·Oe at x =0.055 are observed. The hard magnetic properties of these crystallized samples are related to the presence of the bard magnetic Nd₂Fe₁₄B phase.     

非晶态(Fe1-xCox)77.5Nd4B18.5合金的电阻率的压力系数和压力弛豫研究

在０．０００１－２．４ＧＰａ流体静压力范围详细研究了非晶(Fe_1-xCo_x)_77.5Nd₄B_18.5（０≤ｘ≤１．０）合金的电阻率与压力的关系，得到该非晶合金电阻率的压力系数随组分ｘ变化的规律。结果表明：用少量的钴（ｘ＝０．２）替代铁，不会影响其硬磁性和热稳定性，同时却可减小电阻率的压力系数，从而增强电磁性能在压力下的稳定性。此外还观测到在０．５１ＧＰａ保压３－２４h的结构弛豫，进一步求出该非晶台金电阻率的压力弛豫时间对组分ｘ的依赖关系。 关键词：     

Mössbauer study of amorphous Nd x Fe81B19-x (0≦x≦19) alloys

Amorphous Nd_xFe₈₁B_19-x (0≤x≤19) alloys have been studied by⁵⁷Fe Mössbauer spectroscopy. It is found that the average and peak hyperfine fields and the isomer shift decrease with increasing Nd content x. The magnetization for the samples containing Nd shows a strong tendency to lie in the direction perpendicular to the ribbon plane and its direction varies with Nd content.     

非晶态(Fe1-xCrx)84B16合金的低温热电势

在80—380K之间对(Fe_1-xCr_x)₈₄B₁₆(x=0.01—0.46)非晶态合金的绝对热电势S进行了测量,结果表明,磁性非晶合金的S(T)行为并不都是非线性并有一个浅的极小。少量Cr(x≤0.05)的加入使S的绝对值减小,并使S(T)的极小消失;当Cr含量较多时,样品磁性变弱,S(T)从典型的磁性非晶合金的非线性行为过渡到接近于非磁性非晶合金的线性行为。对x=0.15,0.25的样品,其居里点正落在我们测量的温 关键词：     

Synthesis and characteristics of Fe<Subscript>96-x</Subscript>Zr<Subscript>x</Subscript>B<Subscript>4</Subscript> nanowire arrays

Fe-rich Fe_96-xZr_xB₄ (0≤x≤7) nanowires were first prepared by electrodepositing into anodic aluminum oxide templates. Transmission electron microscope analysis shows that the nanowires are uniform and are about 100 nm in diameter with an aspect ratio of around 75. The broad peaks of X-ray diffraction and the Mössbauer spectrum indicate that the Fe_96-xZr_xB₄ nanowires are composed of α-Fe-like and Zr-rich FeZrB phases. Selected area electro diffraction results also indicate that the structure of Fe₈₉Zr₇B₄ nanowires is amorphous. A vibrating sample magnetometer is employed to study the magnetic properties of nanowire arrays at room temperature. The coercivity of nanowire arrays in parallel to the wire axis decreases with increasing Zr content.     

具有宽过冷液相区的Fe62Co8-x(Cr,Mo)xNb4Zr6B20非晶态合金的热稳定性与磁性

根据制备块状非晶态合金的三条经验准则,选择了成分为Fe₆₂Co_8-xCr_xNb₄Zr₆B₂₀和Fe₆₂Co_8-xMo_xNb₄Zr₆B₂₀(x=0,2,4)的合金系.利用单辊急冷法制备出厚为30μm宽为5mm左右的条带,并用差热分析、X射线衍射以及 关键词： 过冷液相区 铁磁性 非晶态合金     

Mössbauer study of intergranular phase in Nd 8 Fe86 − x Nb x B6(x = 0, 1, 2, 3) nanocomposite magnet

Nd₈Fe_86???x Nb _x B₆ (x = 0, 1, 2, 3) nanocomposite magnet has been studied by Mössbauer spectroscopy and nanostructure observation. It was found that intergranular phase formed between α-Fe and Nd₂Fe₁₄B phase in NdFeNbB alloys plays a significant role on the magnetic properties. By the addition of Nb into Nd₈Fe₈₆B₆ composition, coercivity was found to increase by 25% due to the grain refinement of both the soft and hard magnetic phases which was decreased from 50 nm of virgin Nd₈Fe₈₆B₆ to 25 nm in Nd₈Fe₈₅Nb₁B₆ alloys. The role of Nb addition was confirmed to stabilize the Nd₂Fe₁₄B lattice preventing from thermal vibration of the corresponding sites at where Fe atoms are substituted by Nb in the Nd₂Fe₁₄B lattice. The enhanced coercivity was originated from the exchange hardening of soft and amorphous phases surrounding the hard magnetic Nd₂Fe₁₄B crystal.