材料期刊网

THE MAGNETORESISTANT BEHAVIOR OF Ni_(85)Fe_(15) ALLOY FILM IMPLANTED BYCo~+

G.Q. Li , S. Z. Sun , Z. Xianyu , L.H. Sun and D. R. Li Departmentof Physics , Northeastern University , Shenyang 110006 , China

金属学报(英文版)

Implanting 1 ×1016 to1 ×1017 Co+/cm2 into Ni85 Fe15 alloy film anditschangesof mag netoresistantcharacters were researched . The results show that Co+ is very spectacular on modifying Ni85 Fe15 alloyfilm’s magnetoresistancecharacters. Atlower dose,theanisotrop ic magnetoresistivity ratio( AMR) and thesaturated magnetic field didn’tchange almost. ATmedium dose, the saturated magnetic field does not have great change either, butits AMRisraised from 1 % upto 3% . Thisiscomparabletothebest AMRvalueof permalloy based magnetoresistant material prepared by other methods. But the ion implantation tech niqueisrathersimpler. Whentheimplanting doseishigher,its AMRisalsoenhanced notice ably. However,theincreaseof saturated field saysthe material’sstructurecharacters have changed radically.

关键词: anisotropic magnetoresistivityratio , null , null , null

Q235(G)连铸坯角部横裂纹的影响因素及对策

何天科 , 谢永中

连铸 doi:10.3969/j.issn.1005-4006.2002.04.014

本文对Q235(G)连铸坯角部横裂纹的影响因素进行分析,指出在现有连铸工艺设备条件下,存在易产生角部横裂纹的因素.通过采取措施,铸坯角裂纹得到有效控制.

关键词:

Theoretical studies of g factors and defect structures for cubic, tetragonal, and orthorhombic Fe+ Centers in alkali halides MX (M = Li, Na; X = F, Cl)

Communications in Theoretical Physics

The EPR g factors for cubic, tetragonal and orthorhombic Fe+ centers in alkali halides MX (M = Li, Na; X = F, Cl) are calculated from second-order perturbation formulas of g factors based on cluster approach for 3d(7) ions in three symmetries. From calculations, the g factors of these Fe+ centers in MX crystals are reasonably explained and the defect structural data for the tetragonal and orthorhombic Fe+ centers are estimated. The results are discussed.

关键词: crystal;and ligand-field theory;electron paramagnetic resonance;defect structure;atomic screening constants;spin-orbit interaction;superposition model;resonance-spectra;epr parameters;crystal-field;scf functions;ions;co2+

Investigations of the zero-field splittings and g factors for the rhombic Cr3+-Li+ and Cr3+-Na+ defect centers in Cs2CdCl4 crystals

Physica B-Condensed Matter

The high-order perturbation formulas for the zero-field splitting parameters D and E, and g factor g(x), g(y), g(z) for 3d(3) ions in rhombic symmetry are derived by using a two spin-orbit coupling parameter model, in which both the contributions from the spin-orbit coupling of central d(3) ion and that of the ligands are considered. From these formulas, spin Hamiltonian parameters for the rhombic defect centers Cr3+-Li+ and Cr3+-Na+ in Cs2CdC4, crystals are calculated by considering the suitable defect-induced lattice distortions. The results agree well with the observed values. The contributions to spin Hamiltonian parameters from the spin-orbit coupling of ligands are discussed. (C) 1999 Elsevier Science B.V. All rights reserved.

关键词: crystal- and ligand-field theory;electron paramagnetic resonance;spin-orbit coupling;Cr3+;Cs2CdCl4;superposition model;ions

钼酸盐系列缓蚀剂在含5g/L Cl^-溶液中对Q235钢的缓蚀研究

沈素峰

腐蚀学报（英文）

  通过电化学阻抗谱(EIS)，研究了钼酸盐系缓蚀剂在含g">5g/L Cl^-溶液中对Q235钢的缓蚀性能，结果表明：由钼酸盐为主盐与硅酸盐、磷酸盐、有机胺A复配而成的缓蚀剂，可以达到低成本、高缓蚀率的效果.并通过失重法实验对此配方进行了验证，复配缓蚀剂的缓蚀率接近88.4%，明显高于单组分缓蚀剂.

关键词: 钼酸盐 , inhibitor , compound inhibitors

马氏体含量对St12Q1和St37-2G双相钢力学性能的影响

苏钰 , 符仁钰 , 李麟

上海金属 doi:10.3969/j.issn.1001-7208.2004.04.003

将St12Q1和St37-2G钢在两相区不同温度下加热和淬火,可以得到(F+M)的双相组织,与此同时研究实验用钢在不同热处理工艺下组织和力学性能的关系.结果表明:其应力-应变曲线表现出屈服点低、连续屈服、没有明显的屈服点等特性;提高两相区的淬火温度,可使马氏体量增多;在相同淬火加热温度下,淬火组织的马氏体量随钢的含碳量增加而增多;双相钢的强度只与它所含的马氏体量有关,而与马氏体中的含碳量无关.

关键词: 双相钢 , 金相组织 , 马氏体量 , 力学性能

钼酸盐系列缓蚀剂在含5g/L Cl-溶液中对Q235钢的缓蚀作用

沈素峰

腐蚀学报（英文） doi:10.3969/j.issn.1002-6495.2009.02.034

通过电化学阻抗谱(EIS),研究了钼酸盐系缓蚀剂在含5g/L Cl-溶液中对Q235钢的缓蚀性能,结果表明:由钼酸盐为主盐与硅酸盐、磷酸盐、有机胺A复配而成的缓蚀剂,可以达到低成本、高缓蚀率的效果.并通过失重法实验对此配方进行了验证,复配缓蚀剂的缓蚀率接近88.4%,明显高于单组分缓蚀剂.

关键词: 钼酸盐 , 缓蚀 , 复配缓蚀刺

(Sr0.98-xMx)Al2O4(M=Ba,Ca)∶0.02Eu3+,yG(G=Li+,Na+,K+)红色荧光粉的制备及性能的研究

阎峰云 , 刘兰 , 夏心俊 , 何玲

功能材料 doi:10.3969/j.issn.1001-9731.2017.02.032

采用化学共沉淀法制备出SrAl2O4∶Eu3+红色荧光粉,尝试向粉体中添加辅助激活剂(Li+、Na+、K+),改变粉体中基质元素相对比例,并对粉体进行XRD、荧光光谱分析.结果表明,样品中加入相同摩尔的Li+、Na+、K+辅助激活剂,掺入Li+的粉体发光强度最好.改变Li+的掺入量,当Li+的量为0.04 mol时,粉体发光强度最好.改变粉体中基质Sr2+的含量,当掺入Ba2+时,荧光粉发射峰出现"蓝移"现象;当掺入Ca2+时,荧光粉发射峰出现"红移"现象.

关键词: 共沉淀 , 红色荧光粉 , 辅助激活剂 , 基质

Li2CO3-B2O3-V2O5掺杂ZnO-TiO2陶瓷低温烧结的研究

喻佑华 , 李海南 , 夏萌

材料导报

以Li2CO3、B2O3和V2O5 3种常见的低熔点氧化物为烧结助剂,用传统固相法制备了Li2CQ-B2O3-V2O5掺杂的ZnO-TiO2微波介质陶瓷,并利用XRD、SEM等研究了ZnO-TiO2陶瓷的烧结行为、物相组成、显微结构特征及微波介电性能等.结果表明,当掺入3％(质量分数)Li2CO3-B2O3-V2O5时,在840℃烧结2h可制备出体积密度为4.99g/cm3的ZnO-TiO2陶瓷,达到理论密度的96.5％以上,εr、Q·f、τf分别约为24、22900GHz、-4×10-6/℃.

关键词: ZnO-TiO2 , Li2CO3-B2O3-V2O5 , 掺杂 , 微波介电性能

适用于宽温度范围高稳定的Q开关LiNbO3晶体

吕衍秋 , 袁多荣 , 魏学成 , 孙海清 , 段秀兰 , 王增梅 , 王新强 , 吕孟凯 , 许东

人工晶体学报 doi:10.3969/j.issn.1000-985X.2003.03.002

分析了俄罗斯的Q开关LiNbO3晶体的成分,这种开关用在Nd∶YAG激光测距仪上,能够在温度-50～50℃范围内稳定工作.通过测量紫外吸收边的位置、红外振动光谱、晶格常数和居里温度的方法,测出晶体中的锂铌比([Li]/[Nb])为49.02/50.98.分析认为晶体中的锂铌比是影响LiNbO3晶体Q开关温度稳定性的主要因素.

关键词: Q开关 , 非同成分 , 居里温度 , 晶格常数 , 铌酸锂晶体