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
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Beijing
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ChinaSHEN Baogen GUO Huiqun State Key Laboratory of Magnetism
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Institute of Physics
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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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CHE Guangcan Institute of Physics
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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
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Academia Sinica
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Beijing 100080
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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
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Academia Sinica
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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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YANG Hongying SHEN Baogen YANG Linyuan GUO Huiqun Laboratory of Magnetics
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Institute of Physics
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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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