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对MnFeP_(0.63)Ge_(0.12)Si_(0.25)B_x(x=0,0.01,0.02,0.03,原子分数)化合物的结构和磁热效应(MCE)进行了研究.XRD分析结果表明:MnFeP_(0.63)Ge_(0.12)Si_(0.25)B_x(x=0,0.01,0.02,0.03)的主相均为Fe_2P型六角结构,空间群为P62m.随着B含量的增加晶格常数a增大c减小,晶胞体积基本保持不变.磁性测量表明:随着B含量由0增加到0.03时,Curie温度(T_C)从300 K升到347 K,热滞分别为20,17,11和6 K.0-1.5 T外磁场下最大磁熵变△S_M分别为14.83,11.41,11.26和11.8 J/(kg·K). 相似文献
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The well established and known chemistry of metal phosphides as nucleophilic and reactive precursors has been used as a suitable
synthetic approach in the synthesis of 1,2-bis(butylphenylphosphino) ethane (bppe) (5) andcis-1,2-bis(butylphenylphosphino) ethylene (bppey) (6). Adducts of bridged and bis-chelated gold(I) with 5 and 6, as well as
silver(I) with 5, have been prepared in moderate to good yields. These complexes have been characterised by solution NMR spectroscopy,
mass spectrometry (FAB) and microanalysis in case of 10a, 10b and 11. 相似文献
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《Synthetic Metals》2004,145(1):1-6
Novel europium(III) complexes, (2-pyrazinecarboxylato)(phenanthroline) europium(III) [Eu(pzc)3(phen)] and (5-methyl-2-pyrazinecarboxylato) (phenanthroline)europium(III) [Eu(mpzc)3(phen)] have been designed and synthesized. These complexes were characterized by FT-IR, UV-Vis, and X-ray photoelectron spectroscopy. Photoluminescence (PL) studies showed that the two complexes emitted remarkably red luminescence. When powder samples of Eu(pzc)3(phen) and Eu(mpzc)3(phen) were examined using time-resolved spectroscopic analysis, the luminescence lifetimes were found to be 1.05 and 2.36 ms, respectively. Thermogravimetric analysis showed that the europium complexes possessed good thermal stability up to 345–350 °C. 相似文献
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用液态快淬法制备非晶合金条带时,通过加入15—30%的B与Si等类金属含量是形成非晶状态的必要条件。但是,由于Si与B等类金属元素的加入,使非晶态合金的磁性受到明显的影响。本文实验研究了Si与B含量间的相对变化对(Fe_(80)Ni_(20))_(78)Si_(22-x)B_x合金的饱和磁矩、平均原子磁矩与Curie温度的影响关系。利用电子转移模型与分子场近似理论定性的解释了(Fe_(80)Ni_(20))_(78)-Si_(22-x)B_x合金的磁矩(M_s)与Curie温度(T_c)随 相似文献
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LOCALSTRUCTUREOFSUPERCOOLEDLIQUIDNi_(80)P_(20)ALLOY¥CHENKuiying;LIUHongbo;HUZhuangqi(StateKeyLabofRSA,InstituteofMetalResearch... 相似文献
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利用磁导率减落的自动测量仪,测量了非晶合金(Fe_(0.1)Ni_(0.5)Co_(0.4))_(78)Si_8B_(14)等温时效时退磁不能恢复的减落。以此考查了低温结构弛豫动力学行为,计算了弛豫激活能和弛豫谱。结果表明,低温结构弛豫是平均激活能低的多弛豫过程,在这个过程中发展了化学短程序(CSRO)。 相似文献
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The creep fracture behavior of intermetallic compound(Fe_(60)Ni_(40))_3(V_(98)Ti_2)has been studied.The variation of dislocation substructure was observed with TEM in the process ofsteady-state creep.It is found that there exists a large amount of stacking faults,dislocationpairs and also high density dislocation networks.SEM analysis of section near fracture sur-face points out that the intergranular crack due to coalescence of small cavities is the maincreep fracture mechanism of(Fe_(60)Ni_(40))_3(V_(98)Ti_2). 相似文献
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MAGNETOSTRICTIVEBEHAVIOUROFR(Fe_(1-x)Al_x)_yALLOYS(R=Dy_(0.65)Tb_(0.25)Pr_(0.1))¥WANGBowen;WUChangheng;ZHUANGYuzhi;JINXimei;LIJi... 相似文献
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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。 相似文献
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W.N. Allen P. Brant C.A. Carosella J.J. DeCorpo C.T. Ewing F.E. Saalfeld D.C. Weber 《Synthetic Metals》1980,1(2):151-159
We report the results of the initial investigation of the application of ion implantation for the “doping” of the electroactive polymers, (SN)x and (CH)x. Increases in conductivity have been measured for some (CH)x samples after being implanted. Evidence for the formation of a discrete chemical species has been observed in the case of (CH)x implanted with Br+ ions. Advantages and drawbacks associated with this technique are discussed. 相似文献
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ZHANG Hong Shanghai Institute of Metallurgy Academia Sinica Shanghai China 《金属学报(英文版)》1992,5(10):306-310
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. 相似文献
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Z. Sztuba W. Garvel E. Zaleska H. M?dge S. Matyjasik 《Journal of Phase Equilibria and Diffusion》2000,21(5):447-450
The phase equilibrium diagram for the system thallium (I) telluride-mercury (II) telluride has been constructed from results
obtained by thermal methods employing derivatograph and differential scanning calorimetry (DSC). The diagram has been compared
with that published earlier. The electrical resistances of compounds formed in the system have been measured within the range
from liquid helium to room temperature. 相似文献
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GAO Jinzhang HE Hui YANG Wu and RANG JingwanInstitute of Chemistry Northwest Normal University Lanzhou China 《稀有金属(英文版)》2002,21(4)
The polargraphic behavior of Bi(III)-NOTP complex has been investigated in aqueous solution. It was found thatunder the conditions of pH 3.0 and of 0.02 mol/L NH4Cl, the Bi(III)-NOTP system gives a sensitive second order derivativewave at -0.340 V(vs SCE), which is proved to be an adsorptive complex wave. The composition of the complex isBi(III):NOTP. Furthermore, the peak current is linear to the concentration of Bi(III) in the range from 3.0×10-8 to 5.0×10-6mol/L. Artificial and practical samples have been detected with high sensitivity and receptivity. 相似文献
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HEATCAPACITIESOFFe_(40)Ni_(40)B_(20)GLASSYALLOYMEASUREDBYENTHALPYMETHOD¥JIANGQing;ZHAOMing;LIJianchen(JilinUniversityofTechnol?.. 相似文献
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YANG Jilian ZHANG Baisheng JIN Lan DING Yongfan YE Chuntang Institute of Atomic Energy Beijing ChinaYANG Yingchang SUN Hong KONG Linshu Peking University Beijing China YANG Jilian Associate Professor P.O.Box Sub Beijing China 《金属学报(英文版)》1990,3(8):145-148
The site occupancies in permanent magnetic alloy Y_2(Fe_(0.95)Al_(0.05))_(14)B has been studied bymeans of neutron diffraction.The results from profile refinement show that Al enters thetetragonal structure of Nd_2Fe_(14)B and occupies the 4c and 8j_2 sites of the space groupP4_2/mnm preferably.The relation between the site occupancies and the magnetic proper-ties is discussed preliminarily. 相似文献