材料期刊网

Leaching and mass transfer characteristics of elements from ion-adsorption type rare earth ore

Yan-Fei Xiao , Zong-Yu Feng , Gu-Hua Hu , Li Huang , Xiao-Wei Huang , Ying-Ying Chen , Ming-Lai Li

稀有金属 doi:10.1007/s12598-015-0481-x

关键词:

Fe3B7Nd2Fei4B纳米复合磁体的组织细化

金属功能材料

关键词:

THERMODYNAMIC PROPERTIES OF ALPHA-HELIX PROTEIN - A SOLITON APPROACH - COMMENT

Physical Review E

We disagree with the deduction of the equations of motion for the Davydov soliton and of the results in the paper by Jia-Xin Xiao et al. [Phys. Rev. A 44, 8375 (1991)]. The weakness and faults of the Davydov theory are also indicated.

关键词: davydov solitons;vibron solitons;molecules;excitation;system

Cu-Zr/ZrN薄膜体系的电阻率和纳米压入研究

白宣羽 , 汪渊 , 徐可为

稀有金属材料与工程

采用磁控溅射方法在Si(111)基片上沉积Cu-Zr/ZrN薄膜体系作为扩散阻挡层.通过比较Cu-Zr/ZrN薄膜体系和三元非晶(Mo,Ta,W)-Si-N的电阻率,同时比较Cu-Zr/ZrN薄膜体系和Ta,YaN的硬度,说明作为扩散阻挡层的材料的选取,应从整体性能上考虑,而不能仅仅考虑热稳定性等单一指标.

关键词: 非晶 , 电阻率 , 纳米压入 , 硬度

Measurement of the remnant magnetic-field in Lorentz mode using permalloy

Haihua LIU

金属学报(英文版) doi:10.1016/S1006-7191(08)60120-9

A novel method was reported to measure the remnant magnetic field in Lorentz mode in a FEI Tecnai F20 transmission electron microscope equipped with a Lorentz lens. The movement of the circle Bloch line of the cross-tie wall in Permalloy is used to measure the remnant magnetic field by tilting the specimen and adjusting the objective lens current. The remnant magnetic field is estimated to be about 17 Oe, in a direction opposite to that of the objective lens magnetic field. The remnant magnetic field can be compensated by adjusting the value of the objective lens current.

关键词: Lorentz electron microscopy , Lorentz lens , remnant magnetic field , Permalloy , cross-tie walls

Studies of the g factors and the local structure for Ni3+in LaAl0.9Ni0.1O3, La0.75Y0.25Al0.99Ni0.01O3 and YAl0.9Ni0.1O3

Radiation Effects and Defects in Solids

The electron paramagnetic resonance g factors and the local structure for Ni3+ in LaAl0.9Ni0.1O3 (LAN), La0.75Y0.25Al0.99Ni0.01O3 (LYAN) and YAl0.9Ni0.1O3 (YAN) are theoretically studied from the perturbation formulas of the g factors for a 3d7 ion of low spin (S = 1/2) in tetragonally elongated octahedra. In these formulas, the contributions to the g factors from the tetragonal distortion, characterized by the tetragonal field parameters Ds and Dt are taken into account. According to the calculations, the ligand octahedra around Ni3+ are suggested to suffer 2% relative elongation along the [001] (or C4) axis due to the Jahn-Teller effect.

关键词: defect structures;electron paramagnetic resonance;crystal-fields and;spin Hamiltonians;Ni3+;LaAlO3;LaYAlO3;YAlO3;atomic screening constants;optical-spectra;paramagnetic-resonance;superconducting tapes;lattice-distortions;superposition model;scf;functions;cr3+ ions;crystals;epr

非微扰QCD和核遮蔽效应对K因子的影响

智海素 , 侯召宇

原子核物理评论 doi:10.3969/j.issn.1007-4627.2006.01.002

考虑非微扰量子色动力学物理真空夸克凝聚效应,计算了碳核与碳核在质心系能量分别为630和200 GeV时碰撞Drell-Yan过程的K因子,以及加入核遮蔽因子后非微扰效应对K因子的影响,并把计算结果与没有考虑夸克凝聚非微扰效应的K值进行了对比.结果表明,非微扰效应和核遮蔽效应对K因子影响很小.

关键词: K因子 , Drell-Yan过程 , 夸克凝聚 , 非微扰量子色动力学 , 核遮蔽效应

电沉积铁镍纳米合金薄膜的结构和性能研究

刘天成 , 卢志超 , 李德仁 , 孙克 , 周少雄 , 卢燕平

功能材料

采用电沉积方法从硫酸盐体系镀液中沉积得到Fe18Ni82合金薄膜.运用扫描电子显微镜(SEM),原子力显微镜(AFM),透射电子显微镜(TEM)和X射线衍射分析(XRD)以及磁测量设备分别对薄膜的表面形貌、显微结构和磁性能进行表征和测量.同时利用万能材料试验机和显微硬度计测量了薄膜的力学性能.结果表明:电沉积制备的Fe18Ni82合金薄膜成分均匀,表面平整、光亮、致密,晶粒大小为40～50 nm.薄膜是以Ni为溶剂原子,Fe为溶质原子的置换型固溶体,只存在单一的fcc相,Fei8Ni82合金薄膜沿(111)面有较强的择优取向.镀态Fei8Ni82合金薄膜在50 Hz交流磁场下,测得其饱和磁感应强度为1.08 T,最低矫顽力为20 A/m.19 μm厚的纳米晶薄膜的断裂应力达到785MPa,显微硬度达到605Hv.

关键词: 铁镍合金 , 薄膜 , 电沉积 , 纳米结构 , 性能

低居里温度CuZnTi磁热铁氧体材料的研制

邓联文 , 周亮 , 李慧敏 , 黄生祥 , 丁丽 , 周克省

材料导报

利用ZnFeO4铁氧体材料居里温度对Zn含量敏感的特点,将其作为主成分,通过Cu、Ti离子掺杂技术调整居里温度并提高材料的温度稳定性.采用传统氧化物工艺制备CuTiZn尖晶石铁氧体材料;采用测量起始磁导率的温变曲线间接测量居里温度的方法,获得了CuTiZn磁热铁氧体材料的居里温度.结果表明,Zn含量增加将使居里温度快速下降;材料成分为Cu.0.45Zn0.55Ti0.03Fei.97O4时居里温度为44.9℃,起始磁导率达852.5,且居里温度点磁导率的变化率达50.3/℃,该组分的CuZnTi铁氧体具有良好的自控温灵敏度,可以用作温热疗法磁热材料.

关键词: CuTiZn铁氧体 , 居里温度 , 磁热效应 , 温热疗法

氮化前显微组织对SmFeN合金磁性能的影响

马建勋 , 严密 , 赵传礼 , 肖洪博 , 文玉华 , 杨德仁

材料科学与工程学报 doi:10.3969/j.issn.1673-2812.2005.02.023

本文研究了Sm含量,凝固速度及Nb和Zr元素的添加对Sm-Fe合金微观组织及氮化后Sm2Fei7Nx合金磁性能的影响.研究结果表明:采用真空感应炉熔炼Sm-Fe合金,当Sm的补偿量大于10wt%时,合金铸锭组织中出现大量的富Sm相,这将导致氮化后磁体磁性能的恶化;提高铸锭的冷却速度及添加Nb和Zr等元素可以有效地细化铸锭中α-Fe相的晶粒,减少均匀化退火后α-Fe相的数量,提高磁性能.

关键词: 微观组织 , Sm2Fei7Nx , 磁性能