HU Fengxia State Key Laboratory of Magnetism
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Institute of Physics
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Academia Sinica
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Beijing
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ChinaCHEN Jinchang Beijing Teacher's College
,
Beijing
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ChinaSHEN Baogen GUO Huiqun State Key Laboratory of Magnetism
,
Institute of Physics
,
Academia Sinica
,
Beijing
,
China
金属学报(英文版)
Curie temperature of amorphous alloys Co_(90-x)Cr_x Zr_(10) decreases linearly with increas- ing x.Average magnetic moment per magnetic atom Co or Cr is 1.51 μB or -3.62 μB respectively.The temperature dependence of spontaneous magnetization at low temper- atures is in agreement with Bloch's T~(3/2) law.The spin wave stiffness constant decreases with increasing x from 4 to 20.The range of interaction is 2—3 atoms for x=4 and nearest neighbour atom for x=20.The crystallization temperature increases mono- tonically with increasing x.It may relate to the average number of outer electrons per atom.The crystalline phase components of heat-treated alloys were analyzed by X-ray diffration and thermomagnetic measurement.
关键词:
amorphous state
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null
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null
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CHE Guangcan Institute of Physics
,
Academia Sinica
,
Beijing
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ChinaM.ELLNER Max-Planck Institut for Metallforschung
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Stuttgart
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Germany Associate Professor
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Institute of Physics
,
Academia Sinica
,
Beijing 100080
,
China
金属学报(英文版)
Isothermal section at 25℃ of phase diagram and phase structure of Bi-Pb-Tl ternary system have been studied by means of room and high temperature X-ray diffraction and quenching.
关键词:
ternary system
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LI Yinfeng GUO Huiqun XU Rufeng SHEN Baogen Laboratory of Magnetics
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Institute of Physics
,
Academia Sinica
,
Beijing
,
China
金属学报(英文版)
The disaccommodation(DA)measurements of initial susceptibility were performed in amorphous Fe_(90-x)Ni_xZr_(10)(x=10,20,30)alloys.The DA was measured for two different amorphous states:as-quenched and pretreated at 537 K for 45 min.For all the as- quenched samples,in the isochronal spectra of DA a well defined relaxation peak around 350 K is accompanied by a samll but distinct peak near the Curie temperature of Fe_(90)Zr_(10) phase(T_c=230 K).The reversibility and annealing effect on DA are analyzed within the framework of two-level model.The fits of the theory to the experimental data of reversible relaxation processes gave a spectrum,of activation energies and pre- exponential factor.
关键词:
amorphous alloy
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null
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YANG Hongying SHEN Baogen YANG Linyuan GUO Huiqun Laboratory of Magnetics
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Institute of Physics
,
Academia Sinica
,
Beijing
,
China
金属学报(英文版)
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 average magnetic 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 and α-(Fe,Ga)besides Fe_3 B as major one,were identified.The relationship between room temperature coercive field and Ga.content was also studied.
关键词:
magnetic properties
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null
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null
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Douxing LI and Hengqiang YE (Laboratory of Atomic imaging of Solids
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Institute of Metal Research
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Chinese Academy of Sciences
,
Shenyang
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110015
,
China)
材料科学技术（英文）
The present paper summarizes the current status of high resolution electron microscopy (HREM)and the applications of HREM to materials science and condensed matter physics. This review recounts the latest development of high resolution electron microscope, progress of HREM and the applications of HREM, including the crystal structure determination of microcrystalline materials and characterization of the local structure of the defects and nanostructured materials as well as qualitative and quantitative analysis of the grain boundaries, interfaces and interfacial reactions in the advanced materials by means of HREM in combination with electron diffraction,subnanometer level analysis, image simulation and image processing.
关键词:
