Sm2（Fe1—xCrx）17N～2.7永磁材料的结构与磁性能

研究了Ｃｒ部分取代Ｆｅ对Ｓｍ２（Ｆｅ１－ｘＣｒｘ）１７Ｎ～２．７磁粉磁特性的影响。添加少量Ｃｒ（ｘ＝０－０．１），该化合物的结构不变化。随Ｃｅ含量的增加，它的Ｃｕｒｉｅ温度、各向异性场饱和磁化强度、平均Ｆｅ原子磁矩和平均超精细场均有所降低。材料的单相性显著改善，矫顽力提高。Ｓｍ２（Ｆｅ０．９５Ｃｒ０．０５）１７Ｎ～２．７磁粉的矫顽力ｉＨｃ达到１５９２ｋＡ／ｍ。     

STRUCTURE AND MAGNETIC PROPERTIES OF Sm_2(Fe_(1-x)Cr_x)17N_(～2.7) MAGNETS

研究了Ｃｒ部分取代Ｆｅ对Ｓｍ_２（Ｆｅ_（１－ｘ）Ｃｒ_ｘ）_１７Ｎ_（~２．７）磁粉磁特性的影响．添加少量Ｃｒ（ｘ＝０－０．１），该化合物的结构不变化。随Ｃｒ含量的增加，它的Ｃｕｒｉｅ温度、各向异性场、饱和磁化强度、平均Ｆｅ原子磁矩和平均超精细场均有所降低．材料的单相性显著改善，矫顽力提高．Ｓｍ_２（Ｆｅ_（０．９５）Ｃｒ_（０．０５））_１７Ｎ_（~２．７）磁粉的矫顽力_ｉＨ_ｃ达到１５９２ｋＡ／ｍ．     

Sm_2(Fe_(1-x)Cr_x)_(17)N_(～2.7)永磁材料的结构与磁性能

研究了Ｃｒ部分取代Ｆｅ对Ｓｍ_２（Ｆｅ_（１－ｘ）Ｃｒ_ｘ）_１７Ｎ_（~２．７）磁粉磁特性的影响．添加少量Ｃｒ（ｘ＝０－０．１），该化合物的结构不变化。随Ｃｒ含量的增加，它的Ｃｕｒｉｅ温度、各向异性场、饱和磁化强度、平均Ｆｅ原子磁矩和平均超精细场均有所降低．材料的单相性显著改善，矫顽力提高．Ｓｍ_２（Ｆｅ_（０．９５）Ｃｒ_（０．０５））_１７Ｎ_（~２．７）磁粉的矫顽力_ｉＨ_ｃ达到１５９２ｋＡ／ｍ．     

纳米晶SmFeGaC合金的硬磁性

用电弧熔炼方法制备了Ｓｍ２Ｆｅ１７－ｘＧａｘＣｙ（ｘ≤６，ｙ＝１．５和２．５）化合物，研究了它们的相形成、结构与磁性。用快速急冷方法制备了纳米晶ＳｍＦＧａＣ硬磁材料，研究了淬火速率、Ｇａ含量对矫顽力的影响，得到诀淬ＳｍＦｅＧａＣ的室温最大矫顽力ＨＣ＝１６ｋＯｅ。     

稀土过渡族磁制冷功能材料的研究

本文给出了设计室温磁制冷功能材料的基本原则及具体方法,通过测试、验证得出如下结论：Ｒｅ２Ｆｅ１７－ｘＭｅｘ型稀土－过渡族金属所形成的Ｃｅ２Ｆｅ１６．４Ｃｏ０．６与Ｅｒ２Ｆｅ１５．２６Ｎｉ１．７４化合物具有较好的制冷效果,在外加磁场度Ｈ＝２．０特斯拉条件下,它爱磁制冷温差△Ｔ均可达４．５Ｋ以上,基本与纯金属Ｇｄ接近（△Ｔ＝５．２５Ｋ）,介它们的价格公为Ｇｄ的１／３。     

Sm2（Fe,Ga）17Cy的结构与磁性

在２：１７型稀土－铁－碳化物中，用Ｇａ替代Ｆｅ，可稳定稀土碳化物的晶体结构。本文讨论了Ｓｍ２Ｆｅ１７－ｘＧａｘＣｙ（２≤ｘ≤６，０≤ｙ≤３．０）化合物的形成。结果与磁性，给出了单胞体积Ｖ，室温饱和磁化强度σｓ居里温度Ｔｃ和室温各向异性场Ｈａ与Ｃａ和Ｃ含量的关系，发现在低Ｇａ和高Ｃ样品中，居里温度一般大于６２０Ｋ，室温各向异性场高于１２０ＫＯｅ，快淬方法获得在室温轿顽力大于１３ＫＯｅ。     

Ga替代对Gd2（Fe,Co）17化合物磁性的影响

通过Ｘ射线衍射和磁性测量手段研究了Ｇｄ２（Ｆｅ０．８Ｃｏ０．２）１７－ｘＧａｘ（０≤Ｘ≤８）化合物的结构和磁性。实验结果表明Ｇｄ２（Ｆｅ０．８Ｃｏ０．２）１７－ＸＣａＸ化合物均为菱方的Ｔｈ２Ｚｎ１７型结构,单胞体积Ｖ随Ｃａ含量的增加单调上升,居里温度Ｔｃ和饱和磁化强度Ｍｓ随Ｇａ含量的增加而单调下降。粉末取向样品的Ｘ射线衍射结果表明,随Ｇａ含量的增加,化合物的室温易磁化方向由易面转变为易轴,Ｇｄ２（Ｆｅ．８Ｃｏ０．２）１７－ＸＣａＸ化合物的３ｄ亚晶格出现室温单轴各向异性可能与Ｃａ原子的择优占位有关。     

La_1－zRz（Fe_1－x－yCoxAly）_（13）金属间化合物磁熵变特性研究

本文对用Ｆｅ、Ａｌ替代Ｃｏ的Ｌａ（Ｆｅ（０．７３）－ｘＣｏｘＡｌ（０．２７））（１３）系和用Ｒ（Ｃｅ，Ｐｒ，Ｎｄ，Ｓｍ，Ｄｙ，Ｇｄ）替代Ｌａ的Ｌａ１－ｚＲｚ（Ｆｅ（０．７１）Ｃｏ（０．０２）Ａｌ（０．２７））（１３）系的结构、磁性及磁熵变特性进行了研究。实验发现，Ｌａ（Ｆｅ（０．７８）－ｘＣｏｘＡｌ（０．２７））（１３）系的晶体结构均保持ＬａＣｏ（１３）的立方结构，每３ｄ原子的饱和磁矩与其电子数ｎｄ的关系在富Ｃｏ侧符合刚性能带模型，而在富Ｆｅ侧则与该模型不符。当ｘ＝０．０２时该化合物的居里温度在室温并有较高的磁熵变△ＳＭ，在１．１１ＭＡ／ｍ（１．４Ｔ）磁场下的（△ＳＭ）ｍａｘ为１３ｋＪ／ｍ３·Ｋ。对于Ｌａ１－ｚＲｚ（Ｆｅ（０．７１）Ｃｏ（０．０２）Ａｌ（０．２７））（１３）系，实验发现除Ｃｅ外，其它稀土元素均不能与Ｌａ、Ｆｅ、Ｃｏ、Ａｌ形成１：１３相，而是形成了２：１７相。     

(Dy_(0.7)Tb_(0.3))_(1-x)Pr_xFe_(1.85)和(Dy_(0.7)Tb_(0.3))_(0.7)Pr_(0.3)Fe_y合金的微结构和磁致伸缩

（Ｄｙ０．７Ｔｂ０．３）１－ｘＰｒｘＦｅ１．８５和（Ｄｙ０．７Ｔｂ０．３）０．７Ｐｒ０．３Ｆｅｙ合金的微结构和磁致伸缩研究了Ｒ１－ｘＰｒｘＦｅ１．８５和Ｒ０．７Ｐｒ０．３Ｆｅｙ（Ｒ＝Ｄｙ０．７Ｔｂ０．３，ｘ≤０．５，１．５５≤ｙ≤１．８５）合金的微结...     

YTi（Fe_（1－x）Co_x）_（11）的化学法合成及其结构、磁性能

应用共沉淀－还原扩散法成功地合成了ＹＴｉ（Ｆｅ（１－ｘ）ＣＯｘ）（１１）系列稀土永磁合金（ｘ＝０．０，０．１５，０．２５，０．５），确定了其最佳合成条件，采用ＸＲＤ研究了其晶体结构及在Ｍ１５５型振动样品磁强计上测了其居里温度和磁化强度。得出：ＹＴｉ（Ｆｅ（１－ｘ）ＣＯｘ）（１１）系列合金均具有ＴｈＭｎ（１２）型结构，其晶胞参数随Ｃｏ掺入量增大而减小；居里温度点随Ｃｏ掺入量增大而升高；比饱和磁化强度在ｘ＝０．１５处达到最大。     

SURFACE OXIDATION OF THE AMORPHOUS ALLOY Ni_(68)P_(18)Cr_(14)

The surface layer of Ni_(68)P_(18)Cr_(14) amorphous alloy was studied by AES and XPS associated with ion beam sputtering. It was found that great differences existed between the surface layer and the bulk both in composition and chemical states. The dominant component elements Ni and P were of lower content in the surface laver, while Cr was enriched. Cr was drastically oxidized in the surface layer, but Ni underwent no oxidation. There was a P enriched region just helow the surface oxide layer, which was supposed to enhance the surface segregation of Cr. Ni underwent no oxidation in Ni_(68)P_(18)Cr_(14) amorphous alloy.     

EFFECT OF HEAT TREATMENT ON POSITRON ANNIHILATION OF GLASSY Bi_(1.6)Pb_(0.4)Sr_(1.9)Ca_2Cu_(3.1)O_y

Effects of isochronal annealing on the positron annihilation of glassy Bi_(1.6) Pb_(0.4) Sr_(1.9)Ca_2Cu_(3.1)O_y(BPSCCO)have been reported.It is shown that the crystallization influencesobviously the positron annihilation characteristics of BPSCCO.A maximum is found inthe region of crystallization temperature in curves of mean lifetime and peak/wing ratio,one of Doppler Iineshape parameter,with annealing temperature;the bulk lifetime ofpositron annihilation in the glassy state is longer than that in the crystalline one.Positronannihilation spectroscopy could be used for studying structure of glassy BPSCCO andits change with heat treatment.     

Ni20Ti50C30机械合金化过程中的爆炸反应

机械合金化Ｎｉ２０Ｔｉ５０Ｃ３０粉末发生了爆炸式反应，反应产物中粉末和块状样品共存，经Ｘ射线衍射分析和扫描电镜观察表明反应过程中各存在部分熔化。产物组成主要为ＴｉＣ和Ｎｉ－Ｔｉ金属间化合物。作者认为球磨过程中球与球的猛烈撞击引发了初始ＴｉＣ的形成，其巨大的生成热诱发了后续反应。     

PHASE COMPONENT AND CURIE TEMPERATURE OF Nd_4(Fe_(1-x)Cr_x)_(77.5)B_(18.5)ALLOYS

1.IntroductionThenewhard-magneticNdFeBall0yswithlowNdc0ncentration(35at.%)havebeenobtainedbycrystallization0fam0rphous.ibbo.sI1-3].Theirmagneticpr0pertiesatr0omtemperatureareasfollows:coercivityHc=16O-24OkA/m,remanenceB,=1'2-1.25T,andmagneticenergy(BH).ax=64108kJ/m'.ThevaluesofB.and(BH).axaremuchhigherthanth0se0fthewidelyusedanis0tropic(Ba,Sr)Fe12Ol9ferritesandAlNiC0alloys.Inpreyi0uspapers['-'1,wehavereportedthestructuralandmagneticpr0perties.Recentlywestudiedtheinfluenceofthesubstit…     

MAGNETIC PROPERTIES AND CRYSTALLIZATION OF RAPIDLY QUENCHED(Fe_(1-x)Ga_x)_(77.5)Nd_4B_(18.5) ALLOYS

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.     

退火变脆Fe75Si10B15金属玻璃的脆韧性转变

研究了机械研磨对退火变脆Fe_(75)Si_(10)B_(15)金属玻璃的弛豫过程,晶化行为及脆韧性转变的影响。发现退火变脆的Fe_(75)Si_(10)B_(15)金属玻璃,经不同时间机械研磨,Curie温度T_C逐渐回落,总的弛像焓ΔH_?逐渐回升。在DSC曲线上观察到明显的玻璃转变温度T_(g_1)和一个附加的宽放热峰T_(x_1),随着研磨时间的增加,T_(x_1),T_(x_1),T_C同步降低,与T_(x_1)对应的放热面积ΔH_(x_1)逐渐增大,并在片状粒子表面形成切变带以及与其对应的剪切带,玻璃在退火过程中失掉的韧性逐渐得到恢复。     

BRITTLE-DUCTILE TRANSITION OF ANNEALEMBRITTLED Fe_(75)Si_(10)B_(15)METALLIC GLASS

Studies were made of the effect of mechanical pulverization on relaxation,crystallizationand brittle-ductile transition of the anneal-embrittled Fe_(75)Si_(10)B_(15) metallic glass rib-bon.Results show that the Curie temperature,T_C,decreases and the total enthalpy ofrelaxation increases gradually with variation of pulverized time.DSC traces reveal anextra exothermic peak,T_X_1,and a distinct glass transition endothermic peak,T_g_1,withincreasing pulverized time,T_C,T_X_1,and T_g_1 decrease simultaneously,and the exother-mic peak area corresponding to T_X_1 increases gradually.The surface slip-steps of flakyparticles and their corresponding shear are produced by pulverizing the pre-embrittledamorphous glass.The lost ductility of the glass may restore during annealing.     

HEAT CAPACITIES OF Fe_（40）Ni_（40）B_（20） GLASSY ALLOY MEASURED BY ENTHALPY METHOD

ＨＥＡＴＣＡＰＡＣＩＴＩＥＳＯＦＦｅ_（４０）Ｎｉ_（４０）Ｂ_（２０）ＧＬＡＳＳＹＡＬＬＯＹＭＥＡＳＵＲＥＤＢＹＥＮＴＨＡＬＰＹＭＥＴＨＯＤ￥ＪＩＡＮＧＱｉｎｇ;ＺＨＡＯＭｉｎｇ;ＬＩＪｉａｎｃｈｅｎ（ＪｉｌｉｎＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌ?..     

Y2（Fe.095Al0.05）14B的中子衍射研究

用中子衍射对永磁合金Y_2(Fe_(0.95)Al_(005))_(14)B进行了测量。结果表明:其仍为Nd_2Fe_(14)B型四角结构,空间群为P42/mnm;Al进入晶体结构之中并择优占据4c及8j_2晶位。对Al的择优占位与磁性的关系进行了初步的讨论。     

EFFECT OF ANNEALING TEMPERATURE ON TEXTURE OF COLD－ROLLED Ni_（47）Ti_（44）Nb_9 SHEET

ＥＦＦＥＣＴＯＦＡＮＮＥＡＬＩＮＧＴＥＭＰＥＲＡＴＵＲＥＯＮＴＥＸＴＵＲＥＯＦＣＯＬＤ－ＲＯＬＬＥＤＮｉ_（４７）Ｔｉ_（４４）Ｎｂ_９ＳＨＥＥＴＹａｎｇ；ＧｕａｎｊｕｎＸｉｅ；ＬｉｙｉｎｇＨｕ；ＷｅｎｙｉｎｇＤｅｎｇ；ＪｕＨａｏ；Ｓｈｉｍｉｎｇ（Ｎｏ?..