材料期刊网

LiNi0.7Co0.15Mn0.15O2 microspheres as high-performance cathode materials for lithium-ion batteries

Zhou-Guang Lu , Xin-Xin Tan , You-Gen Tang , Ke-Chao Zhou

稀有金属 doi:10.1007/s12598-013-0097-y

关键词:

La对Fe-P-N合金Snoek-Ke-K■ster峰的影响

戢景文 , 魏全金 , 张国福 , 赖祖涵 , 陈廷国

金属学报

研究了F? P—N合金加?对Snoek—Ke-Koster(SKK)峰的影响,发现与合金含La,P的原子浓度比(C_(La)/C_p)有关:对于C_(La)/C_p较大(例如4.56和2.6)的合金,La有明显增强SKK阻?效应:对于C_(La)/C_p=0.27的P过饱和合金,La对SKK峰无明显影响。

关键词: 内耗 , Snoek-Ke-Koster peak , Fe-P-La-N alloy

SNOEK-Ke-K■STER PEAK OF INTERNAL FRICTION IN Fe-P-N ALLOYS

Y.Y.Che , G. Y.Zeng , Y. C. Xu and J. W , Ji(College of Science , Northeastern University , Shenyang 110006 , China)

金属学报(英文版)

The internal friction and precipitate phases of the deformed Fe-P-N alloys have been investigated. It has been found that the ratio of depends on the content of P and the relation holds if the content of N is lower than 30wt.ppm and the content of P is lower than 640wt.ppm. It shows that the intercept K2 is related to the presence of the atomic pairs and clusters of P in the alloy matrix.

关键词: internal friction , null

LOCAL-STRUCTURE OF THE AXIAL FE3+ CENTER IN THE K+ SITE OF A KTAO3 CRYSTAL

Physical Review B

In order to understand the unusually large value of zero-field splitting D for the axial Fe3+ center in a KTaO3 crystal, Zhou made two assumptions in his recent report [Phys. Rev. B 42, 917 (1990)]. In this Comment we will show that his assumption II is qualitatively reasonable, whereas assumption I is unnecessary and doubtful.

关键词: electric-field;srcl2

First-principle study of electronic properties of Ti3Si1-xAlxC2 solid solutions

Journal of Physics and Chemistry of Solids

The layered ternary ceramics Ti3SiC2 and Ti3AlC2 are isostructural and can form Ti3Si1-xAlxC2 solid solutions combining the advanced properties of both compounds [H.B. Zhang, Y.C. Zhou, Y.W. Bao, M.S. Li, Improving the oxidation resistance of Ti3SiC2 by forming a Ti3Si0.90Al0.1C2 solid solution, Acta Mater. 52 (2004) 3631-3637; E.D. Wu, J.Y. Wang, H.B. Zhang, Y.C. Zhou, K. Sun, Y.J. Xue, Neutron diffraction studies of Ti3Si0.9Al0.1C2 compound, Mater. Lett. 59 (2005) 2715-2719; J.Y. Wang, Y.C. Zhou, First-principles study of equilibrium properties and electronic structure of Ti3Si0.75Al0.25C2 solid solution, J. Phys.: Condens. Matter 15 (2003) 5959-5968; Y.C. Zhou, J.X. Chen, J.Y. Wang, Strengthening of Ti3AlC2 by incorporation of Si to form Ti3Al1-xSixC2 solid solutions, Acta. Mater. 54 (2006) 1317-1322]. In the present work, the solid solutions of Ti3Si1-xAlxC2 (x = 0, 0.25, 0.33, 0.5, 0.67, 0.75, 1) are investigated by first-principle calculations based on pseudo-potential plan-wave method within the density functional theory framework. The results show that as Al content increases in the solid solution, all the bonds have weakened to certain extents, which lead to an unstable structure both energetically and geometrically. The calculated results are compared and discussed with the reported data for the Ti3Si1-xAlxC2 solid solutions. (c) 2007 Elsevier Ltd. All rights reserved.

关键词: ceramics;ab initio calculations;electronic structure;electrical;conductivity;oxidation behavior;mechanical-properties;ti3sic2;temperature;ti3alc2;air;si

EFFECT OF RARE EARTH ON MEDIUM-TEMPERATURE INTERNAL FRICTION OF COMMERCIALLY PURE IRON

JI Jingwen LAI Zuhan WU Yuqin ZHANG Guofu Northeast University of Technology , Shenyang , ChinaLI Guangyi Institute of Metal Research , Academia Sinica , Shenyang , China

金属学报(英文版)

The strong effect of rare earth(RE)on medium-temperature internal friction(IF)of commercially pure iron is closely related to the heat treatment.The RE added into iron has an alloying effect.The Snoek-Ke-Kster(briefly SKK)peak lower as the aging temperature in- creases from 150℃ to 450℃,but it still exists even aged at 600℃.However,the SKK peak temperature T_p does not simply falls as the ascending of aging temperature,it rises again at 600℃ aging.

关键词: internal friction , null , null

硅脂导热涂层改善LED散热性能的研究

张淑芳 , 方亮 , 付光宗 , 董建新 , 陈勇

材料导报

研究了导热硅脂(KE3493)涂层对水下密闭环境下应用的LED灯散热情况的影响,结果表明,LED系统的集成电路板上加入导热涂层能提高LED系统的散热效率,研究结果为导热涂层应用于LED散热系统提供了参考数据.

关键词: 导热涂层 , 散热性能 , LED , 硅脂

BORON ISOTOPE FRACTIONATION DURING PROLONGED ION-BOMBARDMENT

Chinese Physics Letters

Dynamic Monte Carlo simulation is used to explore the B isotope sputtering during 1 ke V Kr ion irradiation. It is found that at both zero and high fluences the light isotope is preferentially ejected in the near-normal direction; meanwhile, there is a low fluence (1.4 x 10(15) ions/cm2), at which the isotope fractionation is independent of the emission angle in the nearly whole angular range.

关键词: simulation

体心立方金属中位错与间隙原子相互作用的回顾——机械波谱术研究

L．B．Magalas

金属学报

根据有关术语、实验结果和理论处理方法的现有数据，对冷加工峰，200，220或250℃峰，Snoek-Koster（SK）峰，以及Snoek-Ke-Koster（SKK）峰进行了评估。并特别强调了葛庭遂教授（Ke）为理解冷加工峰所作的贡献。同时，对由（1）Schoeck，（2）Seeger，（3）王业宁等人，（4）Magalas和Ngai，以及（5） Ogurtani 等人发展的现有理论模型进行了简要的综述.

关键词: Snoek-Koster峰 , null , null , null

体心立方金属中位错与间隙原子相互作用的回顾--机械波谱术研究

金属学报 doi:10.3321/j.issn:0412-1961.2003.11.006

根据有关术语、实验结果和理论处理方法的现有数据,对冷加工峰,200,220或250℃峰,Snoek-Koster(SK)峰,以及Snoek-Ke-Koster(SKK)峰进行了评估.并特别强调了葛庭燧教授(Ke)为理解冷加工峰所作的贡献.同时,对由(1)Schoeck,(2)Seeger,(3)王业宁等人,(4)Magalas 和Ngai,以及(5)Ogurtani等人发展的现有理论模型进行了简要的综述.

关键词: Snoek-Koster峰 , 冷加工峰 , Snoek弛豫 , Cottrell气团 , 葛庭燧 , 内耗 , 机械波谱学 , 位错 , 固溶体 , 铁 , 碳 , 氮