XIANG Li
,
YUE Erbin
,
FAN Dingdong
,
QIU Shengtao
,
ZHAO Pei
钢铁研究学报(英文版)
Combining with the study of analogue experiments and test analysis, the kinetics of precipitation and growth of AlN and MnS in nonoriented electrical steel produced by the CSP process is calculated. The results show that the precipitate phase particles of AlN and MnS in typical nonoriented electrical steel grades produced by the CSP process have grown to some extent in the soaking stage, but the precipitation contents are less than 20% of the total contents of nitride and sulfide. The precipitate phase particles of AlN and MnS have precipitated almost after the hot rolling process. The precipitation contents are more than 80% of the total contents of nitride and sulfide, but it is very late for the precipitate phase particles to grow at the end of the hot rolling process.
关键词:
CSP;nonoriented electrical steel;calculation;AlN precipitation;MnS precipitation
Chinese Physics Letters
Er3+-doped and Yb3+/Er3+ co-doped Gd3Sc2Ga3O12 (abbreviated as Er:GSGG and Yb,Er:GSGG, respectively) laser crystals are investigated by using a combination of spectroscopic measurements and thermal characterizations. An absorption peak of Yb, Er: GSGG crystal shifts to 970 nm and its absorption band broadens obviously, which makes the crystal suitable for pumping by a 970 nm laser diode (LD). This crystal also exhibits a shorter lifetime of a lower laser level, a larger emission cross section and higher thermal conductivity than those of Er: GSGG. All these factors suggest that Yb3+/Er3+ co-doping has a positive effect on improving the spectroscopic and thermal performances in GSGG based laser crystals, and imply that double-doped Yb, Er: GSGG crystal is a potential candidate as an excellent LD pumped 2.79 mu m laser material.
关键词:
mu-m;energy-transfer;gsgg laser;er3+;yag;irradiation;absorption;spectra;ysgg;yb3+
Zeitschrift Fur Metallkunde
A systematic reexamination of the Er - Co system was carried out by differential thermal analysis, optical microscopy, X-ray diffraction and EPMA techniques. A revised Er - Co binary phase diagram is proposed. This binary system consists of four peritectic reactions, three reactions of congruent melting and a eutectoidal reaction. The four peritectic reactions result in the formation of Er3Co, ErCo2, Er2Co7 and ErCo5, respectively. The three congruent reactions involve the formation of almost-equal-to Er16Co9, ErCo3 and Er2Co17. The eutectoidal reaction involves the decomposition of ErCo5 into Er2Co7 and Er2Co17. There are also four eutectic reactions in this system. The solid solubility of Er in Co is extremely small.
关键词:
intermetallic compounds
赵中魁
,
周铁涛
,
刘培英
,
陈昌麒
稀有金属材料与工程
采用TEM对5.6%Zn,1.9%Mg,1.6%Cu,1.0%Li,0.3%Er(质量分数)合金中的Er相进行研究,发现Er在合金中主要以AEr形式存在,Al3Er在合金中的形状为块状、点状、片状或蠕虫状,部分Al3Er与铝合金基体共格.细小的Al3Er可作为η相异质形核的核心.Er在合金的晶界有很大的偏析,而且晶界处Al3Er的存在,使该处晶界析出物不连续.
关键词:
Er
,
AEr
,
晶界
Solid State Communications
Er-doped Si-rich SiO2 (SRSO:Er) films have been deposited on n(+)-Si substrates by the magnetron sputtering technique, and both photoluminescence (PL) and electroluminescence (EL) at 1.54 mum have been observed from the films at room temperature. Dependence of pi, and EL intensities on the excess-Si content and annealing temperature has been studied. It is found that proper Si content and annealing temperature can evidently enhance EL intensity. An SRSO:Er film with 20% excess Si (area ratio of the Si target to the whole target) had more intense EL than a SiO2:Er film without excess Si, both annealed at 800 degreesC, by a factor of 5. This fact clearly demonstrates that energy coupling between Si nanometer particles and Er3+ ions also exists in the EL process as well as in the PL process. Experimental results also indicate that crystallization is not a prerequisite for NSPs enhancing luminescence in SRSO:Er films. The PL and EL spectra of the SRSO:Er films have much broader full widths at half maximum (FWHM, similar to 60 nm) than those of the other Er-doped materials reported. This wide FWHM can perhaps be used in wavelength division multiplexing in optical communication in future. (C) 2001 Elsevier Science Ltd. All rights reserved.
关键词:
thin films;nanostructures;recombination and trapping;luminescence;molecular-beam epitaxy;oxygen-doped silicon;erbium;nanocrystals;light;oxide
朱世旦
,
黄晖
,
聂祚仁
,
文胜平
,
张志军
稀有金属
doi:10.3969/j.issn.0258-7076.2009.02.006
采用金属型水冷模铸造制备了不同含铒量的Al-Er二元合金,通过对铸态及均匀化处理后实验合金的金相观察、电子探针(EPMA)以及透射电镜分析,研究了对不同含量的Er在AI-Er合金中的存在形式及固溶Er在纯铝中的固溶度.结果表明,在本实验条件下铒元素以过饱和固溶体形式存在于α-Al中和以Al3Er化合物的形式分布在晶界上,另外Er在铝基体的最大固溶度为O.1%(质量分数).
关键词:
铝铒合金
,
固溶度
,
EPMA
,
Al3Er相
余胜文
,
王为
,
杨军军
,
邹景霞
,
聂祚仁
中国稀土学报
通过应用Miedema热力学模型方法对添加了微量Er的Al-5Mg合金中的Er的存在形式进行了初步的分析,并结合XRD,TEM试验进行了验证.微量Er在Al-5Mg合金中主要是以Al3Er的形式存在,并且不会出现元素Mg与Er之间的金属间化合物;同时通过XRD和TEM分析证实,含微量Er(0.1%～0.7%)的Al-5Mg合金中Er是以Al3Er相存在并且弥散分布,讨论了Al3Er相与Al基体之间的取向关系,分析了Al3Er相的存在能够改善Al-5Mg合金材料的机械性能.
关键词:
Er
,
Al3Er
,
Al-Mg合金
,
热力学计算
,
稀土
肖志松
,
徐飞
,
张通和
,
程国安
,
杨锡震
,
顾岚岚
,
王迅
材料导报
阐述了掺Er硅发光的研究意义和现状,总结了掺Er硅的材料性能、发光机理、提高发光效率的途径、制备方法,以及掺Er硅LEDs器件的行为和来来展望.
关键词:
掺Er硅
,
发光
,
发光效率
Journal of Physics D-Applied Physics
The model of microwave propagation through electrorheological (ER) fluids has been established according to the experimental facts that the structure and the dielectric properties of ER fluids change with the external electric field. The theoretical simulation shows that the microwave transmittance increases with the dielectric constant of ER fluids if the dielectric constant of the ER fluids is larger than that of the container. Otherwise it decreases with the dielectric constant. The experimental results revealed that the microwave transmittance in the ER fluids could be adjusted by changing the DC field strength. The microwave transmittance increases with the field strength when the concentration of the fluid is low, but it decreases when it is high. The phenomenon that the microwave transmission could be adjusted in the ER fluids can be attributed to the changes of the structure and the dielectric properties of the ER fluids under the external electric field.
关键词:
suspensions
