共查询到20条相似文献,搜索用时 15 毫秒
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MAGNETICPROPERTIESANDCRYSTALLIZATIONBEHAVIOROFANAMORPHOUS(Fe_(1-x)Mo_x)_(79)Si_9B_(13)ALLOYMAGNETICPROPERTIESANDCRYSTALLIZATI... 相似文献
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通过X射线衍射.磁测量和M(?)ssbauer谱测定了Nd(Fe1-Cox)10V2的结构和磁性.结果表明,Nd(Fe1-xCox)10V2(x=0,0.05,0.10,0.15,0.20)化合物的晶体结构均为ThMn12型结构;随着 Co含量x的增大,晶格常数将单调减少.Co原子的替代将导致化合物各个Fe晶位上的磁超精细场值Bhf逐渐增加.Co部分取代Nd(Fe1-xCox)10V2中的Fe原子时.将择优占据8i铁晶位.取向样品NdFe10V2的热磁曲线和变温M(?)ssbauer谱研究结果表明.该化合物在T=120K条件下存在自旋重取向现象. 相似文献
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YANG Hongying SHEN Baogen YANG Linyuan GUO Huiqun Laboratory of Magnetics Institute of Physics Academia Sinica Beijing China 《金属学报(英文版)》1992,5(11):396-400
The Curie temperature increases but crystallization temperature decreases with the in-crease of Ga content,x,of amorphous(Fe_(1-x)Ga_x)_(77.5)Nd_4B_(18.5) alloys.The averagemagnetic moment of Fe atoms is almost a constant.By X-ray diffraction and ther-momagnetic measurements,the crystalline phases of the alloys,an unknown phase andα-(Fe,Ga)besides Fe_3 B as major one,were identified.The relationship between roomtemperature coercive field and Ga.content was also studied. 相似文献
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本文研究了Nd_2(Fe_(1-x)M_x)_(14)B的磁性。少量类金属原子C和Si取代部分Fe,能形成四方结构,且具有单轴各向异性。碳取代Fe,使化合物的Curie温度降低,低温下粘结体样品的内禀矫顽力减少;而Si对Fe的取代可使Curie温度升高,并在x=0.15附近达到极大值。含Si样品在0≤x≤0.10范围内,矫顽力显著增加,室温下从x=0的62.7kA/m增加到x=0.06的138.7 kA/m,并且在x=0.06附近,剩磁有一个极值,饱和磁化强度减少不多。 相似文献
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XING Feng JIANG Chao HE Wenwang Department of Physics Peking University Beijing China Originally published in ACTA METALL SIN 《金属学报(英文版)》1989,2(8):122-126
The magnetic properties of Nd_2(Fe_(1-x)M_x)_(14)B(M=C and Si) compounds have been investi-gated.Substituting Fe by small amount of metalloid C and Si atoms,the compounds are intetragonal structure and have uniaxial anisotropy.The substitution of C for part of Fe de-creases the Curie temperature of the compounds and the intrinsic coercivity of bond samples atlow temperature.The replacement of Fe by Si makes the Curie temperature increase with amaximum at the vicinity of x=0.15.When the range of the content of Si is 0≤x≤0.10,thecoercivity distinctly increases at room temperature.from 62.7 kA/m at x=0 to138.7kA/m at x=0.06,where the residual magnetization has a maximum:in the mean timethe saturation magnetization decreases only by a small amount. 相似文献
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TwodrawbacksrestricttheapplicationoftheR2Fe17compoundsaspermanentmagnet:noneofthemexhibitsaneasycaxismagnetocrystallineanisotropyatroomtemperatureandCurietemperatureTcofthemisrelativelylow.Inrecentyears,variousmagneticmaterialsbasedonR2Fe17havebee… 相似文献
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WANG Ruikun SUN Lihong LI Dongpei YING Qiming T.Takeyama General Research Institute for Non-Ferrous Metals Beijing China Originally published in ACTA METALL SIN 《金属学报(英文版)》1989,2(8):127-132
The magnetic domain structure and related magnetic properties of (NdPr)_(16)Fe_(76)B_8 permanentmagnet have been studied by colloid-SEM method.In thermally demagnetized state,the ma-trix grains in the magnet generally exhibit multidomain structure,i.e.,180° plate-like indi-vidual domain and a few spike-like or maze-like domains.The average width of the domainmeasured was 1.5μm.Grain size of single-domain was observed to be generally about 1μmand only a few up to 3μm.The results calculated are:the domain wall energy γ=36MJ/m~2,the exchange constant A=4.5×10~(-11)J/m,the domain wall width δ=15.7nm,and the critical grain diameter of single-domain D_c=0.5μm.The dependence of high magnet-ic field gradient at grain boundaries in different magnetization directions in the adjacent mag-netic domains located on both sides of grain boundaries and the effect of microstructure on thevalues of K,A and δ were discussed. 相似文献
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在热退磁状态,这种永磁体的基体晶粒一般为多畴结构,单个畴为180°片状畴,也有少量钉形畴和迷宫畴。测得平均畴宽为1.5μm。还观察到一些直径1μm左右的单畴晶粒和极个别直径3μm左右的单畴晶粒,计算出畴壁能γ=36mJ/m~2,交换常数A=4.5×10~(-11)J/m,畴壁厚度δ=15.7nm,临界单畴晶粒直径D_c=0.5μm。还讨论了晶界附近存在高磁场梯度与晶界两侧相邻磁畴内磁化方向的关系和微观组织对K,A和δ值的影响。 相似文献
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1.IntroductionTheternaryRMn2X2compounds(Risrareearth,andXisGeorSi)crystallizeinthebodycenteredtetrag0nalThCr2Si2-typestructurewithspacegr0upI4/mmm,inwhichtheR,TandXatomsoccuPythe2a,4dand4csites,respectivelyl1t2].Theyexhibitillterestingmagneticpr0perties['].InSmMn2Ge2tlireedifferentmagneticorderingtypeshavebeendetermined:ferromagnetismfor153K相似文献
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<正> 近年对于稀土金属和Fe形成的化合物(RE-Fe)的磁性和磁弹性研究已有Clark等的详细报导。在RE-Fe二元化合物中以TbFe_2和SmFe_2的性能最为突出,它们在室温具有大的磁致伸缩值(≈2000×10~(-6))。 二元Tb-Fe合金,当成分为TbFe_2,形成MgCu_2型Laves相结构。由于Laves相材料是一种脆性相的材料,因此这类RE-Fe中间化合物质地较脆;如上述作者在他们的报告中指出的那样,化合物须在1000℃均匀化退火两星期之久,然后获得单相结 相似文献
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ZHANG Shaoying TAI Lichi CUI LiyaCentral Iron Steel Research Institute Beijing China 《金属学报(英文版)》1994,7(1):19-22
The effects of hydrogenation before nitrogenization of Sm_2Fe_(17) alloy on structure andmagnetic properties of Sm_2Fe_(17)N_x powder are studied in this paper.The unit cell volume ofSm_2Fe_(17)increases by about 3.6% and many cracks occur in Sm_2Fe_(17) particles during the process of hydrogenation.The Sm_2Fe_(17)N_x powder treaed by hydrogenation thennitrogenization has the higher content of N and the better intrinsic and technological magnetic properties than that treated by nitrogenization directly. 相似文献
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利用Mossbauer谱、磁测量技术,X射线衍射以及二次离子质谱分析(SIMS)技术,对三元非晶合金Fe_(90-x)V_xZr_(10)吸氢现象及磁性变化进行了研究.实验结果表明:随充氢时间(相同的充氢电流密度)的增加,非晶态合金同质异能移位增加,表明充氢后Fe核处电子密度发生变化.随充氢量增加,室温下合金由顺磁状态转变为铁磁状态,超精细分布逐渐展宽,其最大值也向高场方向移动.吸氢后合金原子磁矩及Curie温度T_C有大幅度增加.0K时饱和磁化强度从未充氢合金的120emu/g增加到174emu/g.Curie温度T_C从257K增加到384K.吸氢导致磁性变化的机理,利用杂化理论模型能够给出很好的解释. 相似文献
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研究了非晶态Ce_2Fe_(23)B_3合金的晶化以及亚稳态化合物Ce_2Fe_(23)B_3的结构与磁性XRD分析证实,Ce_2Fe_(23)B_3为bcc结构,晶格常数α=1.417nm由Ce_2Fe_(23)B_3的室温Mossbauer谱,确定不同Fe位Fe原子磁矩的大小依次为:μFe(48e_1)>μFe(48e_2)>μFe(48e_3)>μFe(16c)>μFe(24d),平均每个Fe原子和Ce原子的磁矩分别为1.94和0.85μB 相似文献